Hate to be the bearer of bad news, but £3650 is more than a bit hopeful. The car is worth £1000, £1250 tops, and for that you'd expect a full MoT, 6 months tax and a tankful of petrol.
This wil give you a good indication;
http://www.volvo-480-europe.org/club...ate&order=DESC
Mind you, it's amazing what folk think a car is worth. There are a couple of 1800ES for sale on carandclassic at over £15,000 apiece - more than three times their true value - but they've been there ages!
Cheers
Jack