No clue if it's a mistake or not but no one has challenged it or if they have it's been thrown out.Well I'm thoroughly confused by this. The maps are TW+EF where TW is the important one. The points on the map are:
Feltham - Hounslow - Richmond - Barnes - Clapham Junction - London
Twickenham - Richmond - Barnes - Clapham Junction - London
This would appear to allow routes via Richmond, except you can't get from Hounslow to Richmond without going through Twickenham. Is this actually an error, or are they trying to prevent something else?