You may not know that if you hold a valid Blue Badge within the European Union you are eligible to register for a 100% discount on London’s Congestion Charge.
Even if you don’t own a vehicle or drive. This is not automatic – you have to register. As other cities are likely to introduce congestion charges in the future, registering will become very important. You can register up to two vehicles that you would normally use.
Visit http://www.tfl.gov.uk/roadusers/congestioncharging/6736.aspx for more info.