As part of a team who are old enough to know better, Ade will be cycling LEJOG between the 19th & 26th June 2010 in aid of the Christie Charity. As Ade ably describes LEJOG is:

For the gentlemen:
Land’s End is the extreme south-westward (but not southern or western) point of Great Britain, situated in western Cornwall at the end of the Penwith Peninsula.
  John o’ Groats is the traditionally acknowledged extreme northern point of Scotland, in north-eastern Caithness. The distance by road is 874 miles (1,407 km).

For the ladies
Land’s End is at the bottom
.  John o’ Groats is at the top.  It’s a long way