It has 6 months T&T and from what I can tell on the pics is in very good condition.
The seller has said I can have it for £650

Cam belt was done at 73,000 and he tells me it's been serviced regularly (I'll see what it drives like before I believe that bit)
Knock off the cost of 6 months tax and thats a super low mileage veg burner for a touch over £500!!!
If it pulls well I'll be cheaky and see if I can knock a few quid off but if nothing obvious presents itself on the test drive I'll be having it

As these things are a pretty indestrucible if it drives well and pulls there isn't much to check for but I'm starting a list anyway;
Oily coolant
Smokey exhaust
Droplinks
Engine Mounts
Oil/Diesel leaks
Starts easily
Turbo pulls from just under 2000 revs
Smooth tickover
Electrics (not many I know but remote locking would be nice)
Can't really think of much else but feel free to add
Also what can I easily transplant from my GLX that an LX doesn't have?
I'll be checking for wiring for front fogs and electric windows in the back, parcel shelf with rear sunblind should be an easy swap, any other suggestions?