[Al Watsky]

Reset the neck.
Shaved bridges are a mistake.
Those little guitars sound fine when the neck is set correctly.
Martin is not necessarily the best place or only place to get your Martin repaired.
Not anymore.
You don't want the guitar re-manufactured ,you want it restored.
Don't be penny wise and pound foolish.
There must be people qualified to do the work in the UK. They aren't hiding, ask respected dealers who they use and or ,as has been said ask Martin for a name or two and then ask them for their references. Not every authorized repair center is the same.