The problem here in the US is when you are in the left lane, passing a line of cars in the middle lane, and then some jerk traveling 35 miles over the speed limit comes flying up in back and starts flashing his/her lights while riding your bumper. When I am done passing the cars that I am passing I will get over, but I have no obligation to rapidly squeeze into the traffic in the middle lane that I am passing.
I see letting faster people pass me as having them clear out the road in front of me. It’s mutually beneficial.