"My pet hate seems to have disappeared with the changes to motorway roadworks - the ones who filter through to the roadworks and then force their way in front of you, effectively delaying everyone else behind them - and then magically expecting you to keep a safe distance behind them when they decided 6" in front of you was fine to pull in. Some do that at traffic lights where filtering is OK if you have somewhere to go, otherwise wait in turn like the rest of us."
Can't entirely agree with that. The whole point of riding a bike as transport, as opposed to purely for enjoyment, is that unless either the road is closed or lights are at red, you never actually have to stop. That's why courier companies use bikes, not cars. Unlike a car, a bike almost ALWAYS has somewhere to go when the lights change, even at a box junction. The whole object is NOT to wait in turn like the rest of us.
Don't hold a bike up; he's not going to hold you up.
That said, I commute (40-mile round trip) on a bike as often as I can, but I, too, am often irritated by the selfish, anti-social and often plain hooligan behaviour of some other riders. There's never a policeman handy when you need one...