I got buzzed by an Audi too, yesterday, as I struggled up Peckham Rye through blasts of wind and rain. As you cross quite a wide junction, the road up the side of the Rye is pretty narrow and busy. Sometimes, it's hard to maintain primary consistently as you leave the wide junction and head onto the narrower road. I had left a touch too much space, obviously, (although, nobody else tried to get through after him) and he had accelerated away from the lights pretty fast. The wind was blasting across the open Rye here, so I was struggling to maintain a straight line in the unpredictable, powerful crosswinds. It was not pleasant. I came close to being Audi-squidged. Following cars waited till there was no oncoming traffic to pass. I gave them a friendly wave. I used to give a thumbs up when passed considerately. However, on one occasion, I became embroiled in an unpleasant argument at traffic lights, having caught up the driver I had thanked just a few seconds earlier. He thought I had given him the finger. He was both puzzled and annoyed and not totally convinced by my explanation. So, now I employ a royal style wave, to avoid further confusions.