Pricey, make sure you do the HPI check with www.hpicheck.com or ring them on 0845 300 8905, the other HPI checks by RAC, AA and others may be cheaper but they don't give you details of the national mileage register. Make sure you give them your email address too, they'll then email you the report directly to your inbox. Have to say this Golf has some interesting history, when you see the recorded mileage you'll be astounded.
I agree the car didn't look like it had covered over 100k, but remember that as a ex-rental/lease car the compnay that owned it (in this case HSBC finance) would have been willing to fix it up good and proper before sending it off to auction, therefore I wouldn't take that as an ultimate indicator. The paintwork on the bonnet didn't have a single stone-chip and I was amazed, but the test drive did seem to let it down a little IMO, it didn't feel 100% (compared to other AUM 1.8T's I've driven).
I'm only doing this to save you the heartache of buying a clocked car, I have no interest in the car any longer and wish you luck in finding the right GTi, my search continues too!