The post above reminds me of last winter. I was on the brompton and overtaken at the top of a steepish hill by a gritter, that thankfully was not gritting. I put my head down and stayed behind him (3ft, maybe a bit close) at a cracking speed (for a brompton!). The car behind me tried to overtake me twice (??). Both times had to pull in for refuges in the centre of the road. Their failed overtaking manoeuvres were then my fault judging by the horn?? Not quite sure what they were going to do once they had overtaken me....