I’d say it’s worth £3800 all day being hpi clear. Air bag lights come on mk5’s for all sorts of reasons but I have personally had one come on by moving the seat on my old 56 plate tdi.
The amount of owners wouldn’t be an issue for me, I’ve owned 4 mk5 gti’s (I think) and a couple of s3 8p’s aswell as a lot of other hot hatch motors and majority of them have had a lot more owners than your average family car... it’s pretty common with this style of car, low owners and mileage is a rarity in performance hatch’s (from experience) and because of that people selling them want top money.