i have little sympathy for the biker in that kind of case. if you don't have room to filter without expecting others to move, you shouldn't be doing it
it's a bonus if people see you coming from either behind them or towards them and move over for you, for which i will always thank them
the question is dojj, why didn't you just move over and give him a bit of room? if you were in your own car and not a works van, would you have done? if you didn't have room, then fair enough, but if it's just bloody mindedness to teach him a lesson, then well done