thanks Johnny.
The buses, I've no quarms about pulling out into a position to block the traffic behind me to let them pull out. I do ride as a vehicle in the centre of the carriage way when commuting but then traffic in London doesn't often go above 20mph. I also wave thanks a lot, which I think another user recently mentioned they did as well.
The refuse truck that let me out was great and I powered it up (14mph) the second section of Hamstead Hill. He pipped probably to say thanks to putting in a visible effort and also thanks for me pulling into a little leeway and letting the 4 trailing vehicles past.
The other was coming down the final stretch which I use as a sprint. Knackering to keep the pace high but I take primary and hit about 35mph. There are a smattering of parked cars and traffic islands to pass. Generally when it's safe I'll move over and wave a vehicle past if I can no longer keep that pace.
It does go the other way as well. Doing 25 on a section this morning, in primary, keeping pace with the traffic in front, leaving enough room to stop and over taking another cyclist. A silly nutter in a BMW decides they want to be in my stopping area. She overtook in the opersite lane, on a right hand bend, powered past me, pulled in and slammed the brakes on. Needless to say I was rather vocal. To the extent that I later rode alongside the other cyclist and apologised for my outburst.
Utterly gutted that last nights commute wasn't recorded as I forgot to clear down my SD card which also smegged me up reporting the above nutter for bad driving.
EDIT: sorry for the big post. I've become a bit of a cycling bore recently according to work.