My worst case was driving down the A1, three lanes. There was slwo traffic in lane one. In lane two were some film location trucks, driven very close together, so they might have been a train, connected. They were going slower than 70, perhaps 55 limited. I had started to pass them, at 70, when I was flashed from behind. Flashy expensive classy vehicle, tailgating, and absolutely no where for me to go - those film lorries were long and there were several of them. I refused to be pushed over the limit, but it took what seemed ages to get past the location stuff. When I moved in to lane two, the big black idiot surged past - and in the back window was a sign telling those who might tailgate him that there were children on board - and from what I saw, there were.