Have had a little time now to red through the invoices, service history etc.
The car has done 128k with a full service history - just about due for it's next one, but supplying garage have changed oil etc, so can probably wait a couple of months. New front pads and discs recently fitted at 123k. New exhuast (full system) fitted by supplying garage before sale (literally still gleaming). Salesman said it'd had the timing belt done twice, but can only find invoice evidence of having been done once at 66k. New O2 sensor fitted about a year ago.
All in all very happy with the quality and quantity of history. Think my original inkling that I've uncovered a little gem looks good on paper ;)