In reply to Tom Last:
The local knowledge and micro-nav point is overplayed. It's not that important.
L1, you might save a minute or two by taking a good contour onto Blencathra, and a minute or two coming down the parachute rather than halls fell. L2, there is nothing in it - follow main paths, or take a cheeky shortcut here or there. L3, you need to find Broadstand - the alternatives are 5-10 minutes slower, coming off Scafell the scree descent saves a minute or two. L4, there are some good trods off the main ridge, but if you keep an eye out for them you can't miss them, if you do it will cost you 5 minutes on some horrible rocky ground, coming off gable there is the Borrowdale fell race descent or the tourist descent - probably only 30 seconds difference for a good descender. L5 there are good and bad lines off Robinson but only a minute in it if you are still strong.
So I reckon with no local knowledge a GPS track and a map in his hand he would only be 20 odd minutes slower than he could be with good local support. I would be surprised if he didn't take a good hour off the record with or without support. That said, I think that he will probably get 5 of the fastest Lakeland runners there are to support him and they will have an amazing time trying to keep up!