Thank you all for the interest. Sorry no prizes for correct guess!!
The person to whom this photo belonged was a water keeper on the River Test in Hampshire. As part of his job he had taken this person dry fly fishing for trout. I know this photo was taken for him as the person concerned was well known and also they had had a good day. The photo came to us after he died in 1973. We just cannot remember who he was after all these years! Nothing was written on the back - did not expect to forget a well known person!
I don't think it is Hugh Greene, what a force for change he was.
Percy Thrower would have interested the owner of the photo, but I am not at all sure.
I would say definitely not Donald Campbell, not the type, too adventurous for a quiet day on the river perhaps.
Barry Bucknell is a possibility but there seems too much hair for the time of the photo. That can go quickly though as I expect some on Rootschat would agree! Does not seem his thing though and this person is a fisherman from his clothes.
Family guesses are someone to do with cricket or Brian Johnson. Not sure of either of those either. Something to do with cricket is plausible as someone in the village was connected with cricket and often brought people down, players and commentators. Not necessarily so perhaps.
Driving us mad, we should know!!