So, after years of trying, I've finally learnt how to trackstand. At least I can easily manage 5 seconds, so should be able to pass my TCL assessment!
But only with my front wheel pointing up hill, so that I can rock back and forwards slightly.
What I cant worked out, or even understand the physics of, is how I now learn to do the same trick on a completely level surface. With the hill gone, what opposes the force I'm applying through my pedal?