There's always phase 1 lake 1 at Makins if you want plenty of action, although the 20's and 30's they rekon are in there must be very shy (or they dont like my bait!).
As somebody else has mentioned, Lakeside and Hopsford both hold decent fish, but can be quite tricky to get out.
There's also a specimin pool at Groby fisheries, which is a very nice lake with some nice fish up to 30 odd, but again I've always found it hard going (4 blanks, and one night/day session with 1 fish between 4 of us). saying that, I have seen some very nice fish come out of there, and they have all been in very good condition. Fisheries.co.uk page has details of that and others.
Clifton lakes on the A5 is similar to Makins, in that there are loads of fish and you'll almost be garunteed alot of action, but the bloke who runs it is a tit and the fish are not in very good condition. I've had just under 20's several times, and know some bigger fish have come out to mates who fish there.
I've only recently moved up here too, well september last year and the fishing has been great. Even days at Makin's phase 2 lagoon lake are excellent fun, especially with all the barbel and tench in there.