Welcome to the site Waterhouse.Such a low mileage for a 1998 bike is pretty unique so I am sure I have seen the advert. The price at nearly £2,000 is about double what you would normally expect to pay for one in good condition of that age, but as said the mileage makes it unique. The advert says it has the original tyres so at nearly twenty years old you don't want to be riding on them. Unless you know the oil and coolant has been recently changed then that needs doing along with the oil filter. Also change all the brake fluid and the fork oil as well. If it runs ok I would then just use it and not worry about the forkseals unless they start to leak.The price might be high for the year but you will never get another with such low miles at any price.If I had more room and less bikes it would have already been sold to me 😃
It sounds too good to be true to me a 3 year old bike averaging less than 600miles a year in it's first 3 years (only new bike I ever owned average more than 600miles a month in it's the first 3 months) then stored for 16 years?. It's going to cost you about 2k-2.5k to buy and get on the road me I would be looking for a much newer and 15-20000 miles on it with a history. What ever you decide enjoy your new bike take it easy to start with till you get a bit of experience and treat every other road user as a complete idiot some wont disappoint you.
I've spoke to the guy and managed to wangle a couple of hundred quid off asking price so all been well I should have a new ( well almost new old ) fazer soon