Anyone else from road.cc doing this. It's arranged by the Cambridge Evening News to coincide with the Olympic torch coming and may become an annual event. It will raise money for local hospices and other charities. If anyone wants to sponsor me I have a justgiving page under my username, (which is my real name - couldn't be bothered to invent one).
It will be the first time I've ridden over 200k and I rode most of the route last weekend and it's pretty good apart from a dodgy bit getting into Huntingdon.