Not the greatest of pictures, but I was taken by surprise. I'm not sure about the fish, but I think it may be a perch.
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Looks more like a Roach to me.
I don't know for sure either way. I'm not bad with freshwater fish; my father was a keen angler (he held the carp record at 44lbs fo many years) and I was brought up with them. I wouldn't like to put money on this one. The photo's not great; I was taken by surprise.
Seriously! Was your dad Richard Walker?
We are not worthy...a real hero of mine when I was a boy!
My Flickr photos...
I'm one of the three sons of his first marriage. There's Richard, four years older than me, and me and my twin brother Tim.
I’m not sure either but I see no stripes on the sides and the dorsal fin, which is erect, looks too rounded to me with no spines for it to be a perch.
Just want to say as a young teenager discovering angling and growing up in the 70 how inspirational your father and the tales of Redmire and Clarissa were to me. Pleasure to make your acquaintance sir.
Lat/Lng: 52.2477, -0.24862
OS grid ref: TL196625