Don't Stop 'till Orkney

I hope to take in some other extremities of this Sceptred Isle, The Lizard (S), Ardnamurchan Point (W), Cape Wrath (NW), Dunnet Head (N), Duncansby Head (NE), Cape Cornwall (Britain's other Cape) and possibly the Orkneys. 20 days should be enough to cover the 1,200 miles.