Wessex Way or West Country Way, Sarn Helen Way, cut east to Pennine Bridleway, cut west to do half of The Lakeland Loop, head north east to Kielder Forest, Cheviot Hills, Scotland End to End.
Well you got to have some dream time haven't you .

I came across a guy who had done an off road LEJOG last year. Is he on here? He had a Facebook page and I think you could get hold of the gps routes from him. Took him about 4 weeks. Looked vaguely exciting, and I want to do it!