"Brancepeth Castle has many exciting holes played across ravines, with the short, par-4 8th followed by terrific back-to-back par 3s and many another fine hole."
I would concur with this, Mark - I thought 1-4 was a very good stretch of holes, and 8-10 playing across the ravines even better. Brancepeth (by Colt, as I understand it) might qualify as a hidden gem all 'round.
Most of the course was thoroughly unremarkable, but the 5th and 6th at Mount Oswald (in Durham) were striking, the former with a blind tee shot and routed across a big ravine, the latter doglegging left back across the same ravine. Both (and especially the 6th) seem to demand you play as close to the ravine as you dare, both for distance and angle on the approach. Those holes intrigued me and stuck out as much better than anything else there.
I thought 4, 11, 13 and 17 at Seaton Carew (Old) had exceptional greensites, but really the whole course was worthy, so perhaps it doesn't qualify for this thread.