Definitely dont get it done at the dealer. I got quoted about ?500 to make my Mk3 GTI remote CL. I got another quote from an independent company (sunroofs, stereos, alarms, etc) for about ?100 + vat to make it remote CL...or as already mentioned you can just buy the interface for about ?60 and do it yourself. Where abouts are you as the places I got quotes from were in Gloucestershire if that is any good?