The petrol forecourt gloves trick did not work that well for me, last year we were riding the Holystone-Blindburn military road, interesting track on a twin, not quite as challenging as Stephen Campbell's Glen Loth recommendation, but still interesting, going on challenging. We got caught out in a downpour when the weather changed from glorious clear blue sky to fairly heavy rain, with no available shelter we stopped on the muddy verge to put on our over suits, getting pretty wet in the process, I then found it pretty near impossible to pull my now wet gloves onto my very wet cold hands, but then I remembered the petrol forecourt gloves in the panniers, great, my gloves slipped on a treat, but then my hands stayed freezing bloody cold for the 50 mile ride back to our rental cottage at Alnwick.
That being said, the discomfort was well worth it, a great motorcycling area of the UK.