I think you've covered it Mike. I'm not up with many ex-UK watchmakers generally but Abel in Belgium can certainly confirm if it's genuine or otherwise......but if you're looking for a service, you could be in for a looooooooooong wait. He is at
http://www.heuertime.com/?lang=eng&p=home
Yes, Rich Askham would be a great UK bet-
http://thewatchspotblog.com/ for excellent work, or Nic Green
http://chronomatic.com/ as you say. I haven't used Nic personally but he's incredibly knowledgeable and I only hear good things about his work.
When it comes to Heuers, these are the top guys that I'm aware of!
Good luck with it and make sure to keep us posted!
Steve
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