After our request back in March 2004, the council have finally installed new treads at the corners where several cyclists have fallen. The new treads have three strips of high-friction surface, rather than the original one. This looks like a high quality, if expensive, solution and should be much better.
However, there are only a few high friction treads at the two corners and we are concerned that they might not be enough to solve the problem. Bikes do not turn on a spot. Please let us know if anyone slips or falls from now on.