Further to Andrew's post on Wednesday I received an informative email from Martin Davies today - most of it is quoted here:
Good news about the Bittern.
Just to say, those pools are actually called Double Locks Wetland
Btw – did you know that we’d recently excavated another pool / scrape in the adjacent field to the North of those pools? We’ve taken a slightly different approach with the new one in that quite a lot of the scrape should develop as wet grassland rather than standing water.
Countryside Project Officer
Exeter City Council