A long way from Edinburgh, but anyone with London connections might want to know that there's a demonstration tomorrow (Sunday 15th July) against the closure of the Lea Valley Towpath for the duration of the Olympics (and well before - it's already been closed)
http://openourtowpath.wordpress.com/demo-july-15th/
This was one of the few safe separated routes in the area and it's hard to see how security demands its closure, especially for such a prolonged period.