The principle of the Anti-Tube Challenge is to visit the full complement of 270 stations, with one very important condition:
At no point in the challenge must a person set foot on a London Underground train. Shared line trains are fair game (e.g. Overground train from Queen's Park to Harrow and Wealdstone), but any London Underground train results in immediate disqualification.
As with the standard full-network challenge, you can use your feet or any method of public transport (both TfL and non-TfL). Private transport is also banned (cars, bicycles, skateboards etc). As I said above, enjoy Moor Park...

Anyone up for it? Better make sure you've planned this well - this challenge will take well over 24 hours to complete (just giving you fair warning).