Value on a 1993 90

Have to admit to being completely green to the whole land rover thing, however there's a K reg 90 sw which I know is going to be replaced pretty soon.

Doesn't have any modification, it may have had some recent basic work to get it through an MOT, but other than that, it's pretty original.

It's been with the same owner for 10 years, but with lots of different drivers who've probably knackered it, so I'm just wondering roughly how much it should be worth, so I know they're not just completely ripping me off, as they have a habit of that sort of thing...

edit: forgot to say: 89k miles

with that mileage, and if it's clean and solid, with decent tyres and so on, it would fetch £3.5 to £4k around here.