Until recently I was using the following email address to get flood data and maps for the thames estuary:
corporate.services@environment-agency.gov.uk
this email account will soon be closed, the new email to use to contact us will be
ensenquiries@environment-agency.gov.uk
Despite having used the original address for a number of years I received no notice that it would be changed, and have found out the above via lengthy googling.
Hopefully it will save you the time!
In this day an age, would it not have been possible to email past customers to tell them about the change prior to closing the account?