Had a very nice ride into deepest, darkest Berkshire with Sam today; well, very nice save that my hands were bloody freezing, despite having the pathetic BMW heated grips set to what they laughably call "high"! Anyway, i bit the bullet this evening and bought a pair of these. They're very well rated on the site, and were designed by Racer in collaboration with Urban Rider in order to provide a solution for those who wanted something less bulky and wearable than the normal offerings out there.
I think I'm going to speak to Lind Motorrad next week and see if I can get a refund on the grips. If not, I guess they'll enable me to set the gloves to a slightly lower setting than I'd other wise use and thereby get more battery life on a ride. Annoying, though.