Alright there mate. If your after busy fishing more than speciman fishing to get your eye back in then I'd maybe try the Angel Of the North fisheries in Gateshead. Its just off the A1 at the southern end of Gateshead. It's a really well run fishery (owned by a couple of vets) but check the website because there are quite a lot of rules and they dont allow deviation from them, so it's not what I'd necessarily call a Carp lake but they are by far the predominant fish with some really nice fish in there. I also enjoyed Felton Fence Fishery (about 6 miles outside Morpeth), Again not the biggest fish in the world (upto 10lb) but again good head of fish and quite busy fishing in a really nice setting. They are a lot less rules orientated as well, allowing you to experiment a lot more when trying out what rigs / methods you want to use.
To be honest Im not sure there are any out and out specimen lakes in the Newcastle area, If there are and you hear about them let me know mate, cause Im looking at going into Yorkshire more this year for 2/3 day trips.