Many thanks to Richard of Online in fitting my Navigation receiver and supplying me a Bluetooth. All worked well on the trip back to Leamington and thanks for sorting out a dumbo with my Keyless Door locking. I purchased the receiver from ebay from a Lithuanian seller including post for the sum of £240.00 as you can imagine I was a bit nervous that it may not work. This chap sells a lot of radio equipment for Mercedes so pm me if you need his details. The two trips to Surrey were worth it as a refurbished unit is about £800 and from Mercedes well over 1 K. So very good result. All I need to get fixed is a new drivers headrest motor.