Thanks for 'most' of your replies. The plan is to drive up very early from the shire and get an afternoon/early evening of riding, then two full days and do Cannock chase on the way home. Inners is tempting as I have done the DH there many times, but I want to keep driving to a minimum.
Kirroughtree is a definite, as is Dalbeattie. After reading recent posts about Drumlanrig I am tempted to try it out. Ae forest XC loop didn't overly impress me, but I was completely overbiked, so it was an awful lot of effort.