capricorn, your supporters can watch you at start then walk thru greenwich park and should arrive around cutty sark before you, then thru foot tunnel to west ferry road (16ishmiles)dlr from island gardens to tower gateway (22miles) then circle/district line tube to embankment(25mile) thenthey can walk thru to the top of st james park and meet you by the a-z boards. sounds easy but they will have a fair bit of work as my wife found out in 2004 when she used this route. best of luck