Must. Overtake. Cyclist.
I did wave a cheery "good morning" coupled with a "look, it's me, I'm here, hello" signal to the woman who'd just driven past me (couldn't even call it an overtake she was so slow getting past) on the approach to a mini roundabout on a housing estate this morning. This despite me being in a good strong primary* and having done plenty of looking round with eye contact and all that as she came up behind me.
Course, she got halfway past, remembered the roundabout and kind of half swung in (although in fairness she must have been vaguely aware of me as she didn't come all the way in) and slowed right down and went over the middle of the roundabout: it's quite a big "mini" roundabout with a heavily raised brick built middle - you can drive over it but not at any kind of speed.
My positioning did at least mean I had space to my left to get clear of her, though I did have to slow right down and wait for her to sort her life out on the exit. She then didn't seem in a hurry to get away, having been in a real rush to get in front of me on the approach, and I kept up with her fairly easily for a few hundred yards, waving politely all the time. She never once looked in her mirror though.
* Is it possible to hold both sides of a road to stop them getting past? I was holding the lane, but couldn't hold the other side of the road.