I must agree with Kevin, Tim Woodcocks route is the best route!!.
Order the instructions, on the website Kev's said then get the original book from the libary to scan the maps from and then get them laminated!
I enjoyed it so much, that since I've done the West Coutry Way (Weston-Super-Mare to Eastbourne) by Tim, and at the moment I'm planning the Sarn Helen Trail (North 2 South Wales).
Be carfull how much you plan 2 do too much in a day as the lakes are tough going when carrying a back pack, we managed it in four and a half days!
Pheww Good Luck!!