Greenwich is on the same line from London Bridge that Charlton is. We went drinking near Woolwich Arsenal before the game last Saturday, and passed through Greenwich.
It wasn't the Three Forts Challenge, was it? I cycled up Truleigh Hill today, and saw loads of nutters running a marathon along the South Downs Way which went by this name.
If it was, kudos!
Wee, actually, kudos anyway.