Just back from seeing the guy. . . .
Turns out it's a farm I have permission on. The guy was really nice, there are three lakes, one of which (the biggest) has 30 pegs. He usually hires it out for £200 for the day, but will do it for us for £150, which would make it £6 a person for 25 people. Folk fishing seemed to rate the water, and some people had taken good bags off it. Carp up to 30lb and all the other roach, tench, perch and other shit.
He also has camping on site, well, just up a hill on the farm, which is I think 10 quid a person, and hook ups and hard standing for a camper et