The route:- which will take you past Buckingham Palace, The London Eye and The Houses of Parliament
On Sunday September 23th there is a London event on, sponsored by Hovis, and called Freewheel London. It is a completely free event which I guess has been designed to get more people cycling in London and will see several roads in London closed for the day for the sole use of cyclists! A 9 mile route has been drawn up that uses mostly Embankment, but will bring everyone back to St James' park where there will be stalls and demonstrations and entertainment and the like. It's not meant to be a race, but just a fun day out, so sign up and I'll see you there.
N.B I actually signed up without even owning a bike. I'm buying one just to take part in something different.
Have a look at the event website here.
(map used without permission, but I hope they don't mind as I'm helping to promote their day.)