It's not good value for money, but it is a great event. Ought to be on the to-do list, really. Did it in 2009 - can't remember how much but it was a lot then as well. It was my first through-the-night race so it was bit of a shock to the system. I remember blundering around in some derelict quarry on Portland about 0200 not having a clue where I was. I think I had wandered off the edge of my map. But happily not off the edge of a cliff.