I've got personal breakdown cover (£75, GEM motoring assist), basically means whatever I'm driving/riding/passengering I can get recovered, even managed to get my caravan recovered from Wolverhampton to Basingstoke when the brakes caught fire on the M54,
In the mean time, keep a mars bar in your toolkit, A: it's something to nibble on to pass the time and raise morale, B: if you're there for a few hours it will atleast keep you from starving to death or eating your own limbs until help arrives C: can be used to trap wild animals if you are expecting to be stranded for a few days or so.