I'm doing it, for the 6th or 7th time and I'll take my usual gear - ron hill pertex top and a pair of dead cheap waterproof from Tisos, chucked in an old North Face bumbag. What to wear depends a lot on the weather and how long you think you'll be out. If you get a calm sunny day it can be like spring, but if it's cold and windy then the tops are very exposed and you'll be glad of hat, gloves, tights and maybe a jacket. Best not take chances, especially if you're towards the back.

It's a great race, with a cracking atmosphere. Enjoy it.