Have an X-Plate here, now on 105,0000ish miles and still going great (OK it's also had a lot of work done to it).
Apart from the above here's some otehr things to look at:
.. take the spare wheel OUT and check for rust under it, if you have any it should only be light and on the surface (it's the lowest point in the boot so any trapped liquids sit there!!!)
.. check the condition of rear brakes, esp the calipers - these are quite week on the cars and can sieze.
.. AUQ engine will make at least 210BHP, perhaps a little more with a remap.
.. As others have said CAMBELT - do not leave this to chance, if it's more that 4 years old or more that 60k miles get it changed (about 3-4 hours to do at a garage).
ta, Dave