It may well be worth hooking into some of the Cyclists Forums. It is just possible that someone out there could help with transportation of drop bags for you. The cyclists do this on a regular basis so will have a host of info on overnight stops that may be of use to a runner.
Foot Care : Day one Gortex Boots and Gaiters so dry feet.
Day 2 on very deep water and bogs : Army Surplus Gortex Socks with Marino blend socks underneath. The AS socks were brilliant. They cost £ 9.50 .look as ugly and misshapen as hell but are built to keep a soldiers feet dry when carrying a 40 Kg pack through hours of bogs.Mine were previously owned by : SMITH 232.
I ran unsupported which makes the race a whole lot harder.
GPS was used as a back up to the Map and compass. The most difficult nav was in the farmland areas as a small mistake could lead you into a dead end field boundry.