There were three people who appeared to be doing "laps" of the flat bit up the top. I mean maybe they just wanted somewhere car-free to cycle, but hardly seemed worth the effort!
I think maybe they thought that this was the only flat car-free bit of Edinburgh. I mean, what's wrong with Princes Street?
Further up this thread, or possibly on another thread (I'm too lazy to look back), somebody, can't remember who, mentioned that they'd seen a drop bar bike with lights stuck into the ends of the bars. Then the bike chain linked to these on their facebook page yesterday. I thought they looked pretty nifty, so went in on my way home last night and purchased a pair. From the front they look like this:

and from the back they look like this:

They also have a flashing orange indicator light built in - don't think I'll use that, cos I'm a bike not a car, but you never know.
Oh, the other thing was that they are the only lights ever which have made me chuckle the minute I took them out of the packaging.

Not bad for 16 quid. I'll be modelling them at Arthur's Seat on tuesday night.