No doubt I'll refine this page on an ongoing basis but here we go for starters:
Long Distance Paths
Coast to Coast (ultimate aim!)
West Highland Way
Dales Way
Offas Dyke Path
Cotswold Way
Cleveland Way
Cumbria Way (not sure about this one)
Pennine Way (or this one!)
Challenge Walks
Yorkshire 3 Peaks
New Walking Areas
Wales
Scotland
North York Moors
Current Walking Areas
Cheviot Hills
Northumberland
Lake District (including Wainwright's 214 Fells)
Peak District
Yorkshire Dales
North Pennines