I meant to do this a while back and forgot sorry The new London Congestion Charging zone takes in the RBH. If you have a Blue Badge (dizzy badge) then you can register a couple of cars and add on short term ones. It takes about 10-14 days and there is a one off registration fee of £10 but bearing in mind that the CC is £8 it worth doing if you are going to the RBH by car. More info here:
cclondon.com/downloads/Disa...
Bex