Some info on the Olympic Velo Park ahead of it's official opening at the end of the month. It seems at least some of the tracks are more or less open if you can find the gaps in the fence!

http://diamondgeezer.blogspot.co.uk/2014/03/velopark.html

The bit I'm most interested in is if the towpaths on the old river Lea are open from Tottenham Hale to 3 Mills. A lot of that runs right through the middle of the Olympic Park and has been closed for a few years now.