In reply to Rylstone_Cowboy:
Yes, Crookrise is a good choice. However, you should note that there are currently restrictions in place as the moor is closed on many days in Sept for grouse shooting. The sign by the stile at the end of the reservoir track implies that the closure includes access to Crookrise, though I note that the BMC RAD has no mention of this and I cannot see any information about it elsewhere online. From memory I think that the restriction applies on Sat 13th but not on Sun 14th. There are other closed days later in Sept too.
If anyone knows for sure whether this closure applies to access to Crookrise, it would be useful to know.