A brave man choosing to go for a FSI, I have two! Yes there are lots of old posts about expensive repair sagas with the FSI but I have half an idea that was from garages unfamiliar with the BAD engine, (BAD not an adjective, just the engine code and the butt of many jests from the majority TDI owners on here). There is not that much expertise in the average garage on this rare engine and I suspect the high cost of many repairs was basically down to unfamiliarity. There are some known competent garages, ask if in need, WOM are often championed and with the knowledge on here built up over the last decade I think the FSI is viable. But as Paul said be aware of history.
The main failing is the notorious inlet manifold flap problem, basically carbon build up leads to faults and it's a long old job, expensive on labour, to put right, fault code 17439 if I I remember correctly. See that on your code reader and knock at least £750, as a ball park figure, off the price but if previous bills show its been done then excellent. The fault occurs anywhere between 60k and 120k, again ball park figures, so much depends on fuel type and type of typical daily use. In fact I would recommend any FSI owner to have the inlet manifold cleaned at 80k as preventive maintence and then set good for another 80k. Your prospective purchase is 113k!!!!, about 2/3 of expected life.
I keep a keen eye on FSI prices and of late prices from dealers have gone up a lot, maybe a blip, and to me they all of a sudden seem to be getting the price right in unison, wierd, whereas for the last two years they were almost random. The price of your Bristol advert is about right from a dealer especially if you can barter £200 down, but it is so difficult without seeing the car in person and inspecting service history, but on the higher side of right.
Some trivial points about the car in question I noticed.
4 seater not 5 as advertised.
The blanking plate behind the ASR button is depressed.
The climate control buttons have been done, the darker black tends to show up with a camera picture and not as much to the eye.
Typical worn headlight switch.
Passenger air vent has missing slider.
The picture of the steering wheel with the engine running frustratingly just blocks out where the engine fault light would occur, probably just an accident and not devious!
Good luck with any purchase.
Andy