As Andy says - Mk5.
Those headlights looks super nasty, eBay specials. Some people on here have liked them though so if it's what you want sure why not?
The alloy wheels look like reps as well and not actual Monza IIs.
It's low-spec for a £4.5k and as you said is cat D. Is there any ability to get a GTI? Or is it insurance/petrol costs that's ruling them out?
It does have leather seats which is a plus and from what I can see has a RCD 310 radio, which is not standard, which I would think is better than the standard radio? Not sure.
I would get a standard GTI at £3.5k with more miles.