It's a Mk5
Look for rust, EVERYWHERE

especially around the rear arches although they're not as important as the sills....
BUT it says it has 12 months MOT and for £425 that's a years worth of cheap motoring
Engines on those are fairly reliable, also look out for bottom arms on the suspension, listen to it as you pull away in a straight line or steering slightly, if there's a clunk they may need replacing.
Not tremendously expensive to fix though so not the end of the world