They should, in general, take a leaf out of Wilf's book; he owns and runs Hazelcopse Fishery in Surrey.
From £15 you may take one fish and then fish C&R until the sun sets!!
His fish fight like devils and he often stocks HUGE fish. He only sometimes asks that the big ones are returned........and I mean sometimes and this is just down to how much they cost and by returning them it helps keeps the costs down and enables someone else to catch them too
Not the prettiest fishery, but fun and most people are polite and helpfull at the fishery.
Highly reccomended
SKB