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I'm based in Scotland but happy to send it somewhere if need be. As I say local watch shop won't go near it.
What would a timegrapher do?
Jw89-
A timegrapher uses a microphone to calculate various values which can be used to identify the condition of the movement. Differences in the different values can sometimes point towards a root cause. One of the values is seconds gained/lost per day. You can also test in different positions which can help diagnose further.
I reckon it's very fixable.
Stonehedge
I wouldn't start off by fiddling with the regulator tbh. If the drop did actually cause the timing change it's probably a mechanical issue somewhere in the movement. Something out of alignment. You won't be able to fix that by regulating it.
Do you know anybody with a timegrapher? Where are you based?