I can't remember the start time (could look it up!), but, first year at least, I hit Exmoor at dawn – which was splendid (I was briefly first on the road so no-one had disturbed the wildlife until I came along).
My home in Axminster was a control that year. Subsequently it was the Primary school, but the headmaster wasn't overly enthusiastic after a couple of goes. Honiton's perhaps not too far away.