Nobody was fishing when I was there. In fact I'm fairly sure I was the only person there, I saw nobody else and there were no cars parked.
The place does look fishy and the bank from which fishing is permitted would certainly give sufficient room for carp fishing, pod etc.
I live about 4 miles from there so will, at some point, give it a go. Rude not to, really.
Even if there are no carp I'd be content to try for good perch. Oh, forgot to mention, live baiting is absolutely NOT permitted. It's a Nature Reserve, after all!
Ian