If you are still looking for a place for this year's Ride London 100, I've been phoning around on behalf of our club. A couple of charities still have a lot of places.
Hope For Children have at least 10 spaces. Register here http://www.hope-for-children.org/events/ride-london-100
Pancratic Cancer UK also have spaces. Register here:
Although they have a target for raising funds, I can not believe they will hold you to this. They do however want to recoup their entry fees.
You will need to be quick because the deadline is 5PM tomorrow! Registration is via the charity.