A guy this morning demonstrated how not to do it.
Reletively big chap on a mountain bike in his beige linen trousers (!) and shirt. Overtook him down Haverstock Hill (so much more fun now the kids aren't at school!) but got stuck at the next lights, so he puffs past me and parks himself in front of me. Despite being overtaken three times over the next few lights he still insisted on parking in front of me at every light, even though I was at the stop line . .. . . . . . soooooooooo annoying! (especially as safe overtakes are not always that easy down Chalk farm rd in rush hour).
If I know someone is faster than me I wait behind them at lights - it's only polite!