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@Simon
It seems Scott gave us the correct answer while I was driving back to the LBS :-)
Turns out that what they had done was to remove the spacer from one side and then redish the wheel to correct. This would be fine on a multi-speed bike of course, but on a flipflop it's no good at all, because I'd have ended up with different chainlines on fixed and freewheel.
Luckily the spacer was still sitting on top of his tool box so I got it back and refitted it (myself!). The hub spacings are now perfect again as per Surly's website, so all I need to do now is change it from 130mm to 126mm.
nv55's suggestion would have been perfect except that the 2mm 'spacer' is integral to the locknut, so instead I intend to get a local machine shop to take 2mm off both spacers in a lathe, resulting in a perfect 126mm hub. If this works I'll post details and photos as it'll be a useful mod for people with 126mm dropouts.
And yes, Scott is right, I'll have to have it dished again once this is all done (by a different LBS!) as it's now 4mm off to one side.
Phew. We'll get there in the end...
Simon