I've been doing some head scratching on this one and i'm begining to think it wasn't the fueling but something electrical, the first time it happened i was using my heated vest off the battery, and when i got into town a few miles from home i turned it off and the bike became more lively, then the other morning t was -2 so tried turning my heated grips on and got a flashing light which i guess meant low power and they wouldn't come on, as the bike took a few turns to start i figured i'll try again after i'd downa few miles to get some charge in the battery, anyway, tried a few more times and it still refused to switch on. tried again that night when i left work, the bike fired up fine and the heated grips worked straight away.