Good luck for tomorrow Simon, looks like it is going to be quite an event. Just been glancing back through some of the comments on this thread, and just seen yours about the toughguy challenge. My friend has done this and now she wants to do it again! She sent me an email asking me to join her, but I think not, too soon for me, have only been running since June, and just not ready for that kind of race yet, maybe next year.
Good luck to anyone else doing the GNR tomorrow.