Most of that info was actually from years back doing GCSE and A-Level geography! Apart from the Springwatch bit - that was because I watched the programme.
I get your only wanting one or two for yourself, but I've always felt the distinction between angling and fishing was that anglers did it for the enjoyment of catching the fish, weighing and photographing and then putting them back. Fishing is for consumption and the two should be considered different by the authorities and have different rules. You were also harming the UK fishing industry by catching your own rather than buying those caught by the professional fishermen who rely on it for their living
Having said that there is apparently a problem with a few predominantly foreign individuals taking fish out of local fishing spots like Coombe Abbey.