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I think that the small fish might well be a Roach, though there is no detail visible to back that up. The larger one is certainly not a pure Roach, though, as the Dorsal fin starts well back from the base of the pelvic fin...suggesting perhaps at some Rudd in there somewhere. It is also deeper in the body, like a Rudd. A hybrid, I am sure.
My Flickr photos...
Don't really know much about hybrids but the deeper body was noticable hence my uncertainty. The smaller one appeared to be a younger version of the larger.
Am not a fishing person myself, picked the ID from what the fisherman said and comparison pics.
The larger fish is in my opinion a silver bream.
No, it is not a Silver Bream. For one thing, the eye is too small...Silver bream has a large eye. I think it is either a hybrid or pure Roach, but, as I have said, I favour the first option.
The reason I opted for roach was because of the smooth line from the head through the back. Bream always seem to have an noticable hump behind the head. I noticed the unusual depth of body but did not make much of it until ophrys mentioned hybrids. Having read a little about them now am inclined to agree but have never seen a silver bream so will give these a look to.
Thanks for the help folks
Lat/Lng: 53.75769, -1.42968
OS grid ref: SE376291