Paul Chell is your man for a top end reblue, I'm guessing in the ball park of £120-150 for better than new finish, but I believe he has personal issues and it'll be a while before he takes on any more, there are various cold blue options if you wish to have a go yourself, search the forum, there should be plenty of advice as to how to go about it. I've had reasonable results myself with a few cold blue systems