I think W2 has most bang for your buck.
+1 make sure you do the black option on whites aswell (best bit).
brechfa and do red and black.
+1 Do Blue aswell ;)
do you mean UK, Eng, wal, sco?
Can i also add forest of dean in to the mix Ride the Red and the new blue(really good fun)
Go to cwmcarn and do a couple of laps
only one trail there, its very good but unless you are going to ride the DH a couple of time there not enough there for a full day.