dont know car looks clean get it checked over by a mechanic or subaru specialist and reg check it
and bring it for a good long test drive at least 20min you would be surprised what you can miss on a 5 min run with the owner chatting away
good luck
I bought an STi top mount off that guy a few weeks back!had a look around his car (didnt drive her or anything) but she is immaculate with genuine low milage too.
The owner is a sound guy (far from a boy-racer) a subaru enthuiast (owned a good few scooby's and knows his stuff) and has this car very well looked after.be surprised if he didnt take a hit on the price too.