ercall reservoirs good i'v had a 20, 22 and loads of doubles out there this year just fishing boilies tight to the weed.
stirchley pools, parkers and dandy pool have alot of carp in their doubles and quite easy to fish, people say the withy and apley are quite good but i don't fish them much.
if your after the bigger carp there's blue pool, middle pool, baylisses but they are a bit harder and also trench but i think thats very hard.
i hope this helps