Gonna fly the south west flag here...
In order of my preference:
Lamorna Cove, nr Lands end
Burrator, Dartmoor
Portland Bill
Portland quarries
Bonehill, Dartmoor
Coombestone Tor, Dartmoor
Cligga head, nr Perranporth, Cornwall
Porthcawl in south wales is also good. Plymouth is good for street.