In reply to The Pulsing Motorik of Neu!:
Would give Dave a shout. Super helpful guy. May not be portable but will surely give you a steer.
Am not a boulderer (and haven't clambered over 'em for, err, about 50 years now) but the Glenda boulders must be worth a shot.
As Al Manson once said in the Caley guide. 'And now we've come to the best bit - the boulders. Well, they're out there. Enjoy!" (or words to that effect.)
Mick