In reply to LakesWinter:
Yep, went to Rivelin for a quick visit this morning. It was lovely! Rock perfectly warm in the sun and not much problem with dampness. The sun was fully on the crag, perfect blue skies, even some snow sprinkled hills visible across the valley to make a great view.
Thanks to the team from Stafford who looked after my guidebook that I left behind. Fortunately I wasn't so far away after taking my wife to work early in the afternoon, so was able to go back and jog up to the crag to recover it.