Chew valley lake?
You were not
oceans away with that suggestion, Timmer.
We're on or near the Wrington Vale Light Railway again, aren't we?
We are (or
were) indeed.
That is the view northwards along the dam built to create
Blagdon Lake in the 1890s.
Directly behind me was the terminus station of the Wrington Vale Light Railway - now a charming private residence, as featured on the front cover of 'Somerset Stations, Then and Now', by Mike Oakley (ISBN 978-1-904-34994-5)