If I'm on a road where it would be foolish to take secondary position, because there are parked cars on one or both sides and/or the road is too narrow to allow overtaking, I'll possibly (two times out of ten, maybe more) get beeped at. Obviously I'll let people overtake if they're able to go faster than me, and there is a safe space to do so, but I'll be the judge of that! Really that means that on almost every road I'll find a place to allow safe overtaking; might not be right away, the car behind might have to wait some seconds, but thats how it is; I'd say that on 9 out of 10 occasions or more I'll find a way to allow safe overtaking. Anyway, if I'm going along a road and a car is going far more slowly than I want to go, Ill make it clear that I want past (get on the right hand side behind the car, make eye contact in the mirrors, look at the space in front, you know, act like a car driver behind a cycle). On no occasion do I recall a motorist moving aside to allow me to overtake; it doesn't happen. I don't remember any motorist moving over, ever, just to allow me to pass. Why is that?