All depends on condition, MOT tax etc........... I went to see one recently in "average" condition with no MOT or tax and he wanted £350 minimum.I was going to pay it out of basically wanting an SR and with a view to keeping the car long term.Luckily I was messed around by the seller and I didnt end up buying it.After much thought and advice from others I realised the car wasnt worth that much at all even if it is an SR. As a VERY rough guide (and I dont mean to offend) if the car has been standing for a number of years (outside) and has no MOT or tax but I understand yours has full service history and 1 owner from new, its going to be worth "as is" around the £200/250 ish mark depending on the condition of the bodywork. My advice would be restore it, MOT it yourself and use it or get it MOT'd before selling.