In reply to TheDrunkenBakers:
Well there is the circuit of Ullswater from Pooley Bridge, 40 miles over High Street, Kirkstone Pass, Helvellyn, Dodds. Langdale Horseshoe 18 miles, Northwest fells from Braithwaite 20 miles. True, though, hills in the Lakes come in tidy little packages, often difficult to make up long satisfying routes.