In reply to wolfbane:
Longest Helvellyn route. Leave South Devon coast at 0600. Drop son off at Princetown on Dartmoor for 0700. Drive to Lakes, book night in Camping Barn at Greenside on way up. Arrive barn 1300, go up Striding Edge in full winter nick, down Swirral.
Back at barn endure a shocking cold night. Up at 0400 for breakfast outside under a bruised purple black sky. Wade to Striding Edge through thigh deep over night snow drifts. Call mum from Helvellyn Summit at 0800 to wish her happy mother's day.
Nethermost Pike, down edge to Hard Tarn, back up Jogebar Gully, back over Helvellyn Summit, Swirral Edge, Catstycam, descend N side to dam in Keppelcove. Leg it back to car. Short shut eye then drive home. Nice weekend.