So you want "an 05 seat leon cupra r 225ps with 16k miles" eh?
Well that's uncanny, it's exactly what I bought 6 months ago, same miles same year. I love it to bits.
JamJay might be slightly optimistic in saying it'll never go below 25 to the gallon, I remember when i took it round Lydden Hill I got 6.4...
If you're used to a diesel, be prepared to spend some money on her, but I feel that since you're going to spend a fortune keeping anything on the road it might as well be something special. Just bear in mind that the bits do add up (things like tyres, petrol, tax, insurance, ARBs, remaps etc).
Honestly though mate, if you're after a practical motor that goes like a rocket you won't regret it.