Last year they insisted that you carry full kit. Most people did.

If you've not got a good sense of direction (like I haven't) it's worth getting behind a local or at least someone who knows where they're going for the very top. I got dropped by the runners in front of me last year and spent about 20 seconds wandering about at the top trying to pick which route to run down. It's not very intuitive, especially if it's misty.