Right, spent some time playing with it today, and have discovered that the rear wiper doesn't work, but the washer jet does, and the rear screen heater doesn't work. I'm guessing the wiper just needs a new motor? Other than that theres just an oil leak that the owner is aware of and will have fixed for me. Is this a good deal for £1k?
The absolute key question for answering - "is it worth it?" - is the condition of the body and chassis. Disco 1's are rot boxes, so checking very carefully for rust problems is where you should be spending your time this week, imo.
Mechanical things, wipers not working etc is small beer by comparison to replacing sills, for example.
Anything can be repaired, but if it needs: new sills, a new boot floor rear wheel arches and front inner wings (all common weaknesses) then the vehicle is only worth scrap value as you will have loads of trouble re MOT-ing it.
Get underneath, and with a light hammer tap along the sills to find weaknesses. Check the boot floor by removing the carpet and the rubber sound-absorbing mat to get to the metal floor - is the mat wet? If it is you've more than likely got a leak letting rainwater in.
Have a look in the engine bay at the inner wings, they will almost certainly have some rust. It might be small and a quick cheap repair or it might need repalcement panels - not so cheap.
Condition is everything when valuing cars, the seller can ask whatever price they like, but that doesn't mean it's worth the asking price.
lets face it these are old vehicles that were never very well protected, so they will be rusty. Don't get sucked in by silly asking prices - this is a 15 yr old car !!!!!!!! And it's not a classic car that will appreciate in value, so buy wisely.
Here endeth the first lesson..............................
Good luck
Dave