I have had a number of valuable vintage pieces serviced by Bexley, and now Kings Hill since their move, and have always found their knowledge, skills and advice to be exemplary. Each piece looking fantastic and running to COSC.I understand that the vintage items are given special care and only touched by senior watchmakers. I always give very specific instructions to ANY watchmaker.
I hope all works out well for you as I can understand how you feel having had a recommended watchmaker in the past gouging a groove in an irreplaceable dial. And just to underline that any company can err, I once received a vintage watch back from Patek and the winder fell out!! That followed a £1200 service.