glyn, same thing happened to me on my diversion 900 with doris on the back.
2 lanes clearly marked, people carrier takes the right, i take the left. he then staight lines the r.a.b. sideswiping me. we managed to stay upright & came to a stop.
i decided to clear off as stoopidly my mot was a week out.
he was left with a hole in his passenger door, maybe he'll think twice before doing it again, maybe he wont.
anyway, glad you wern't hurt