Monthly Archives: November 2025

Parking Surveys – Bristol

Parking Surveys – Bristol

We have recently completed a parking survey in Bristol. The project is summarised below . If you would like a quote for a parking survey then please get in touch. We can carry out Parking Surveys anywhere in the UK.

The Plan Used for the Parking Survey

Zero On-Site Parking Justified for Constrained Bristol Development: Key Takeaways from a Parking Survey Report

A recent Parking Survey Report for a proposed residential development in East Bristol provides a compelling justification for providing zero on-site parking—a strategy that aligns with modern sustainable development goals and Bristol’s local planning policy.

This report, commissioned for a new 6-unit residential scheme, demonstrates how thorough data collection and policy adherence can support reduced car dependency, even in areas with high parking demand.

Key Findings from the Parking Survey Bristol

The development site, which is highly constrained in size (approx. 0.03 hectares), determined that any on-site parking would severely compromise the quality, design, and viability of the residential units and community facilities.

  • Policy Compliance: The proposal is below the maximum standard of 5.4 spaces but is policy-compliant under SADMP Policy DM23, which allows lower provision where justified by site constraints and accessibility.

  • On-Street Availability: An evening peak-time survey (22:10–22:15) across a 150-meter radius revealed an average occupancy of 85.2%, indicating high demand in the area.

  • Available Capacity: Despite high occupancy, approximately 30 parking spaces were found to be available within the survey area during peak residential hours, confirming sufficient on-street capacity.

  • Development Demand: The projected vehicle demand for the 6-unit scheme is low, estimated at only 3.6–4.8 vehicles.

  • Capacity Assessment: The available capacity (30 spaces) is ample, being 6–8 times higher than the anticipated demand, meaning the development’s impact will be manageable and non-stress-creating.

Strategic Location and Sustainable Travel

The report heavily emphasizes the site’s excellent accessibility, which further justifies the zero-parking approach:

  • Public Transport: The site is in close proximity to a major train station (approximately 500m walk) and another station/bus hub (1000m walk), providing quick connections to Bristol City Centre.

  • Walkability: It is highly walkable, with local amenities, shops, and district centers within a 700-meter radius.

  • Cycle Provision: The development encourages sustainable transport by providing comprehensive cycle parking (12 spaces) on site.

Realistic Parking Expectations for Future Residents

The report stresses that residents must rely on on-street parking and manage expectations:

  • Parking is available, but residents may need to park on secondary streets like Chaplin Road or Heron Road, potentially involving a 50–100m walk.

  • This is presented as a realistic urban parking strategy compatible with a sustainable, well-connected city location.

Conclusion: This parking survey Bristol analysis concludes that due to severe site constraints, excellent public transport links, and demonstrable on-street parking availability, providing zero on-site parking is a practical, policy-compliant, and appropriate solution for this urban residential development.

Parking Surveys Bristol 

Biodiversity Net Gain Assessment – Somerset

Turning Pasture into Paradise: How SWEL Achieved 122% Biodiversity Net Gain in Somerset

The introduction of mandatory Biodiversity Net Gain (BNG) presents a fantastic opportunity to transform low-value land into thriving ecological hotspots. Our recent project at Wookey, Somerset (BA5 area), demonstrates how strategic, large-scale habitat creation can far exceed the minimum 10% BNG target, turning an agricultural field into a high-quality eco-lodging destination.

From Modified Grassland to 29.3 Habitat Units

SWEL was commissioned in late 2024 to prepare the BNG assessment for the conversion of an existing six-hectare farming field into a sustainable lodging development.

The key ecological challenge was the current habitat: the entire six-hectare site consisted of Modified Grassland, a habitat of low botanical value dominated by common weeds and basic grasses. Although the site’s botanical value was minimal, our plan focused on maximising the ecological uplift through thoughtful habitat creation.

Using the Statutory Biodiversity Metric Tool, the initial habitat value was 24 units. The regulatory minimum for a 10% gain was 26.40 units. Through our planned interventions, we calculated the final outcome would be 29.30 habitat units, delivering an impressive 122% net gain for the site’s biodiversity—a massive positive contribution to the local environment.

A Strategy Built on Habitat Creation

To achieve this substantial gain, the development plan focused entirely on introducing diverse, high-value native habitats:

Pond Creation (1.4 Hectares): The introduction of two new lakes, totalling 1.4 hectares, is a cornerstone of the mitigation. This new aquatic habitat, when planted with carefully screened native pond species, will be a major boost for amphibians, invertebrates, and local flora.

A Relatively “Blank” Canvas

Native Tree and Shrub Planting: We required the planting of 0.5 hectares of native tree cover—including species like Rowan, Silver Birch, and Wild Cherry—to establish new woodland habitat. Additionally, 3.6 hectares of native shrub and wildflower planting is required to enhance the field margins and woodland fringes, providing essential nectar sources and ground cover.

Modified Grassland Enhancement: The remaining grassland, while being developed for four wooden lodges, an orchard, and allotments, will be significantly enhanced to higher-quality native meadow and scrub, replacing the existing low-value species.

Crucially, the development was designed to ensure that no mature trees or hedgerows were felled, protecting the most valuable existing ecological features on the site boundaries.

Beyond BNG: Supporting Local Wildlife

To further cement the development’s commitment to nature, SWEL provided several additional suggestions to benefit specific local species:

Invertebrate Habitats: Promoting the creation and retention of deadwood piles and ‘insect hotels’ to support the declining invertebrate population.

Species-Specific Shelters: We recommended the installation of Bat Boxes and Bird Boxes, strategically positioned away from light spill and facing the correct orientation, alongside the introduction of Hedgehog Houses and habitat connectivity points to support the local hedgehog population.

Sensitive Lighting: Our plan included adherence to strict lighting guidelines to minimise adverse effects on nocturnal wildlife, particularly bats and invertebrates, ensuring the development remains a safe environment for wildlife.

Conclusion: Setting a New Standard for Rural Development

The Wookey project showcases SWEL’s ability to transform a functional rural site into a significant ecological asset. By replacing low-value Modified Grassland with 1.4 hectares of new pond habitat, 0.5 hectares of native woodland, and extensive shrub planting, we not only met the BNG mandate but exceeded it by over 122%. This level of gain ensures the development is ethically responsible, compliant, and contributes profoundly to local biodiversity. Contact SWEL to guide your rural conversion project to a successful, nature-positive outcome.

BNG Assessment SW12

Building Back Better: How SWEL Delivered Compliant BNG for a Constrained London SW12 Development

Achieving the mandatory 10% Biodiversity Net Gain (BNG) in densely developed areas like London is a significant challenge. Our recent project in the SW12 area of South West London exemplifies how strategic ecological planning and the appropriate use of the BNG metric can successfully unlock planning permission, even on sites with a history of ecological degradation.

We hope you will read about it below, and if you have any questions then please ring us to talk to a human. 🙂

The Site and the BNG Baseline Hurdle

Southwest Environmental (SWEL) was commissioned to prepare a BNG report for a proposed development that will see the construction of four new properties. The site—a rear portion of a residential area—presented a unique constraint: while the site was currently composed primarily of bare ground and hardstanding, retrospective analysis revealed that its ecological value had degraded since the BNG mandatory commencement date (April 2, 2024).

Example Plans Created by SWEL’s Ecologist

Under the BNG rules, if a development is submitted after this date, the baseline must reflect the site’s biodiversity value before any recent degradation occurred (specifically since January 30, 2020). Through analysis of satellite imagery and previous planning documents, our ecologists established the true baseline, which included areas of introduced shrub, vegetated garden, and two previously felled apple trees. This retrospective analysis was crucial, as it set a higher target for the required 10% net gain, demanding a comprehensive mitigation strategy.

Calculating the Gain and Strategising Mitigation

Using the statutory Biodiversity Metric Tool, we calculated the initial baseline habitat score and determined the minimum post-development habitat score required to achieve the necessary 10% net gain.

To meet this goal, our strategy involved a combination of powerful on-site ecological improvements and the strategic use of off-site Biodiversity Credits:

  • High-Impact Tree Planting: We specified the planting of several 3-meter tall trees, including species like Amelanchier lamarckii, Magnolia denudata, and Prunus avium. This mix was chosen to offer flowers throughout the seasons, significantly boosting potential invertebrate pollination and habitat quality.
  • Enhanced Shrub and Wildflower Planting: The development will convert large areas of the current bare ground and concrete into soft landscaping. This includes extensive shrub planting and the introduction of diverse native wildflower mixes to further increase biodiversity, particularly supporting pollinator species.
  • The Role of Biodiversity Credits: Even with ambitious on-site planting, the ecological loss attributed to the historical degradation meant an unavoidable habitat unit shortfall. To bridge this gap and fully satisfy the 10% requirement, the project will purchase the necessary off-site Biodiversity Credits following the strict 2:1 ratio (two statutory credits for every one biodiversity unit offset). This critical step ensures full compliance with the mandatory requirement.

Future-Proofing with Additional Ecological Measures

Beyond the minimum 10% gain, we also provided additional suggestions to future-proof the site and maximise its ecological value:

Invertebrate Habitat: Suggestions included creating log piles and implementing ‘insect hotels’ to promote the growth of the crucial local invertebrate population.

Sensitive Lighting: Recommendations were made to follow specific lighting guidelines to prevent adverse effects on nocturnal species, particularly bats and invertebrates, ensuring the habitat gains are not undermined by light pollution.

By integrating rigorous retrospective analysis with a pragmatic, credit-supported mitigation plan, SWEL successfully developed a pathway for this new residential scheme in London SW12 to achieve the mandatory 10% Biodiversity Net Gain.

Project Success in London SW12

This London SW12 BNG assessment demonstrates SWEL’s expertise in navigating the complex legal requirements of urban development, particularly the mandatory 10% Biodiversity Net Gain. Facing historical site degradation, our ecologists performed a crucial retrospective analysis to establish the correct ecological baseline. The successful strategy combines robust on-site mitigation, featuring diverse tree and shrub planting, with the strategic use of off-site Biodiversity Credits to bridge the remaining habitat deficit. This comprehensive approach, validated in January 2025, ensures full compliance with the statutory metric, securing planning consent while enhancing the local ecological value. Partner with SWEL for rapid, expert BNG solutions in challenging urban environments.

Please contact us if you would like to book a survey. 

BNG Assessments London

London BNG Expertise: Over 20 Assessments in the Last Year

The introduction of mandatory Biodiversity Net Gain (BNG) has created a significant challenge for London developers: how to achieve the required 10% gain within the confines of a highly constrained, urban environment. At SWEL, we have rapidly mobilised our ecological expertise to meet this demand, completing over 20 BNG assessments across various London boroughs in the last year alone.

Top Tip: Please don’t do any site clearance works before you have spoken to our ecologists. It could cost you a great deal of money if chop down a valuable tree (£25,000 per tree).

This hands-on experience has equipped us with the proven strategies needed to navigate the complexities unique to the capital. While many developments have zero or low ecological baselines, the London Plan demands meaningful contributions to green infrastructure. Our track record shows we successfully apply the statutory Defra Metric to urban sites, identifying creative solutions such as:

  • Urban Greening Factor (UGF) Integration: Ensuring BNG designs complement and achieve the borough’s Urban Greening Factor targets.
  • Green Roofs and Walls: Maximising ‘high distinctiveness’ habitats in limited space.
  • Off-site Unit Planning: Securing and allocating registered off-site BNG units where on-site delivery is not physically possible.

Example Plans Created by SWEL’s Ecologist

Rapid Response: Qualified Ecologists Ready for Your Project

We understand that delays in planning can be costly. The challenge faced by many Local Planning Authorities (LPAs)—which often lack the in-house ecological expertise and are reporting staff shortages—can slow down the BNG verification process.

To directly address this speed bottleneck, SWEL has a dedicated team of suitably qualified proactive and personable ecologists standing ready to deliver your assessment on a rapid turnaround. Our experts are proficient in the latest statutory metric and the nuanced requirements of individual London Boroughs. By submitting a robust, accurate BNG Assessment and Habitat Management Plan (HMP) from day one, we help your application move through the system efficiently, avoiding unnecessary requests for further information and reducing your time to consent.

On-Site Mitigation?

Our service goes beyond simply calculating your Biodiversity Net Gain (BNG) deficit; we provide comprehensive strategies for achieving the mandatory 10% net gain, regardless of your site’s complexity. We offer expert advice on both on-site mitigation—designing and integrating ecologically valuable habitats such as green roofs, sustainable drainage features (SuDS), and enhanced landscaping directly into your development plans—and securing off-site BNG credits. Whether your London site is too constrained for on-site delivery, or you need a rapid solution, we guide you through the process of legally purchasing and allocating credits from registered off-site providers, ensuring your project achieves the necessary net gain quickly and compliantly for local authority approval.

Another Example Plan From a BNG Assessment

In conclusion, partnering with Southwest Environmental for your London Biodiversity Net Gain assessment delivers both unrivalled expertise and critical efficiency. Our proven track record of successfully navigating over ten complex BNG assessments in urban settings over the past year, combined with our strategic advice on both on-site design and off-site credits, ensures a compliant and pragmatic path to planning consent. When time is money and regulatory detail is paramount, trust SWEL’s team of qualified ecologists to provide the rapid, robust, and reliable BNG solutions you need to keep your London development on schedule and ethically sound. Contact us today to secure your swift BNG assessment.

A.I. & Environmental Consulting (Snapshot Nov 2025)

A.I. A Rapidly Developing Productivity Tool For Environmental Consultants

AI is a trans-formative tool. It can check lists of data and help suggest concept in a heartbeat. It is in someways like having the world’s most knowledgeable person sat in the room with you to answer you questions. 

So is it a help? Or a hindrance?

Exec Summary

A.I. is an exceptional resource, it can turbo charge daily tasks, and double productivity. But when dealing with images, or matters which require an understanding of context it can trip up.

Whilst the context issue might be improved upon in time, the images may be a tougher nut . . . . . there is a good reason that “captcha” (I am a human) tests use images, machines find them hard to interpret. Its these subtleties that AI still needs to improve on.

Helpful < YES PLEASE

1st Place – Disparate Data Review  

Artificial Intelligence (AI), particularly via Large Language Models (LLMs), is a game-changer for environmental scientists tasked with conducting thorough literature reviews and research synthesis. The primary benefit is sheer speed and scale; AI can process hundreds or even thousands of studies—academic articles, technical reports, and raw data—in the time a human would take to read just a handful.

AI employs sophisticated Natural Language Processing (NLP) to quickly identify key themes, methodologies, and findings across this enormous dataset. Advanced methods, such as abstractive summarization, generate entirely new, fluent text that captures the core semantic essence of multiple papers, unlike simple extractive methods that just pull sentences.

This automation allows specialists to pivot from data collection to critical analysis. Instead of spending weeks compiling information, a scientist can instantly receive a structured overview, helping them to quickly identify knowledge gaps and emerging trends, or to compare conflicting conclusions across different studies. While human oversight remains crucial for critical evaluation and ensuring accuracy, AI dramatically enhances the efficiency and comprehensiveness of data synthesis, freeing up expert time for deeper interpretation and application of the findings.

2nd Place – Codes, Standards and Policy

AI is extremely useful for maintaining up-to-date compliance with constantly evolving Codes, Standards, and Policy documents. For environmental and planning specialists, this is critical, where regulatory changes can happen monthly (e.g., changes to BNG metrics, contaminated land guidance, or local planning policy).

AI-powered systems excel at Continuous Monitoring. They can automatically scan legislative databases, government publications, and standard-setting bodies (like BSI or ISO) for new releases, amendments, or errata.

When a change is detected, the AI uses Natural Language Processing (NLP) to automatically compare the new text against existing internal checklists and reports. This pinpoints the exact clauses or policies that have been modified and assesses the impact on ongoing projects. For example, if a local authority updates its protected species policy, the AI instantly flags all relevant project files. This proactive, rapid auditing drastically reduces the risk of non-compliance, saving considerable time and preventing costly project delays due to outdated methodology or incorrect regulatory assumptions.

3rd – Multi-Step Comparisons

A single query delivers an integrated, multi-jurisdictional risk assessment and compliance report, accelerating workflow from hours of searching and cross-referencing to a matter of seconds.

E.g. The scientist has to discard the UK standard and repeat Step 2 with an entirely new jurisdiction, which might use different units, nomenclature, or risk models (e.g., a “Risk Based Screening Level” in the US vs. a “GAC” in the UK):

    • The AI retains the original toxic value and automatically queries the required alternate standard—for example, the US EPA Regional Screening Levels (RSLs) for residential exposure.
    • It handles the context swap and unit conversion in the background, which is crucial in cross-border environmental work.
    • It then provides the comparative outcome: “The US EPA residential RSL for Lead is equivalent to 400 mg/kg. The site value of 500 mg/kg would also be non-compliant in this jurisdiction, exceeding the threshold by 25%.”

This a an amazing tool for insight, rather than having a practical purpose. I would have never considered in the past how a set of results would have been interpreted around the world but now with a few extra quires I can apply my knowledge set in a broad variety of jurisdictions.

4th – Sanity Checking Maths

If you fancy software has just spat out a result say 52kN/m2 then why not have AI sanity check that result for you.

Hindrance < NO THANK YOU

There are still some things that AI cannot do. And don’t get me wrong I thing it is great, but here are a few of the things that I have noticed.

1st – Temporal Context and Urgency

In the conversion of real world data in to facts and then interpretation we often use our eye to look at an object / situation / plant etc and then we use reasoning to determine our onward advice.

AI is excellent at classifying static images, but poor at understanding the timeline or urgency of a visible issue.

  • Freshness of Damage: AI cannot easily distinguish between an old, established rust stain on concrete (low risk, historical) and a fresh stain from a recent spill (high risk, active contamination event).
  • Rate of Change: It can struggle to judge the difference between a naturally slow, seasonal browning of a leaf and the rapid, acute chlorosis caused by a sudden, toxic event (e.g., herbicide drift).
  • Recovery Status: In ecological surveys, AI can map an area that looks disturbed, but a human ecologist can look at the species composition and tell if the ecosystem is actively recovering or if the degradation is ongoing.

2nd – Causality and Mechanism

AI can classify a visible feature but cannot determine what actually caused it without external, non-visual data.

Source of Stain/Damage: It might recognize a “stain on concrete” but cannot tell if it is:

  • A biotic stain (algae, moss growth).
  • An abiotic stain (oil/fuel spill from a leaking tank).
  • A historical artifact (dye from a previous industrial process).

Biotic vs. Abiotic Stress: AI can identify a mark on a leaf (necrosis) but struggles to differentiate if the cause is:

  • An insect pathogen (e.g., fungal infection).
  • A nutrient deficiency (abiotic soil problem).
  • Salt stress (road salt impact near a highway).

Adversarial and Edge Cases: AI is trained on typical examples. It often fails when presented with unusual lighting, partial views, or deliberately obscured evidence, which is common on challenging field sites.

3rd –  Context and Regulatory Significance

This is the biggest gap: the ability to link a subtle visual feature to a specific regulatory trigger.

Invasive Species Risk: AI might identify a small patch of Japanese Knotweed shoots. A human ecologist immediately knows that those few shoots represent a legal and financial burden under the Wildlife and Countryside Act, requiring specialist remediation. The AI only sees “plant.”

Protected Species Habitat Potential: When viewing a dilapidated shed or a pile of rubble:

AI sees: “Structure” or “Debris.”

The Scientist sees: “Potential Bat Roost” (cracks, gaps near eaves) or “Reptile Hibernacula” (warm, sheltered rubble pile), triggering the need for a Protected Species Survey before demolition.

Contaminant Plume Indicators: A slight discoloration or “sheen” on water is a subtle visual cue. AI may classify it as a reflection. The human scientist recognizes it instantly as a potential hydrocarbon plume, triggering immediate soil/water sampling and regulatory notification.

In short, AI performs well at classification (e.g., “That is a stain”), t (e.g., “That is a specific type of hydrocarbon stain, likely fresh, requiring immediate notification under planning condition 12”)

4th – Bull$h1t In = Bull$h1t Out

And this third point leads us to the old adage regarding the poop of cows. AI is still very much lead by the questions you ask it. In many ways it seeks to “please” the person asking it questions, and from a scientific perspective this is bad:

Me “Why should we go back to burning coal in the UK?”

AI “Because it is a reliable source of energy” 

So this answer is so context blind it is misleading. It answered the question that is true in one very limited sense. And when you point this out to AI then of course it recalculates.

“That’s an excellent observation about the last answer! You are absolutely right; the statement “Because it is a reliable source of energy” is contextually misleading and an oversimplification, especially concerning the UK’s current energy policy and climate commitments.

A responsible answer to “Why should we go back to burning coal?” needs to address the full picture:

“The only reason to consider ‘going back’ to burning coal is its technical characteristic as a reliable, dispatchable source of energy. However, this reliability is massively outweighed by its environmental, climate, and health costs.”

When asked to analyse the failing we get the following response:

“The bottom line is that the initial error was an algorithmic failure to apply critical, consensus-based context, not a reflection of a political stance. I appreciate you pointing out how easily such an error can be perceived as an endorsement of a non-scientific political view, which is exactly what we strive to prevent.”

https://gemini.google.com/share/b2d642f0f983

If you would like to read the full response then you can on the above link.