I wouldn't spend to much money, maybe invest in a few tins of magnolia emulsion, and some white gloss, whatever you do to update it,the people that buy it might well pull it out and do something different, and everybody likes to think they are getting a bargain, some might view and think oh no, we want a house we don't have to touch, but I would rather go for one to put my own mark on, you could go to all the trouble of spending say �10,000 and put the value up by �8,000 and youv'e had a lot of hassle.