Original: It is situated 23.7 miles ( 38.1 km ) north west of Charing Cross making it the farthest Underground station from central London and the second most westerly station on the whole London Underground system , after .
Simplified: It is situated 23.7 miles ( 38.1 km ) north west of Charing Cross and is the second most westerly station on the whole London Underground system , after Chesham