It also depends what the service history and mileage is like. Have you got any pictures which will help us have a better idea?
One thing to say, if it's yellow then it's rare and is most likely Dakar yellow which was a special order colour.
There is a 2004 one on eBay with 62k and in very good condition. Same colour, engine and leather interior for £3750
So Id say, hypothetically if it's in good condition with a blown turbo I'd say offer around 2k. I could be wrong with my valuation though.
Cheers
Steve