Jay's right. There are 200 million houses in this country, and you don't have time to deal with these kinds of headaches. Buying a house like this is like marrying an alcoholic spouse abuser in the belief that they will change once you get married.
Don't even think about closing on any house without a real estate attorney at your side. $500 on attorney's fees is CHEAP insurance, and they will help you understand the 90 pounds of documents you have to sign at closing as well.
I'm serious about the 90 pounds. Who'd have guessed you could get a writer's cramp signing your own name?