For those of you with the BMT version, you will be amused to know that it costs £10 to register your car to not pay the charge. What's more it's worth noting that you have to download the form, send it off in the post with a photocopy of your V5C and cheque and wait up to 10 working days before your registration is complete. Here's a link to the form. http://www.tfl.gov.uk/assets/downloads/greener-vehicle-discount-application-form.pdfEdited by: yapmaul