GB 4 Points
The route is between the 4 compass points of the British mainland. It can be ridden in any order, and in fact the shortest route is S-E-N-W.
Most southerly - Lizard Point, Cornwall
Most easterly - Ness Point, Lowestoft, Suffolk
Most northerly - Dunnet Head, Caithness
Most westerly - Ardnamurchan Point, Argyll.