Re finding out how much it was sold for...in addition to the advice given you could also contact the Land Registry as the property has to be registered with them and they can tell you how much it sold for.(posted 7763 days ago)It might cost £4 but you can do this by e mail (at least you can in Scotland).
This is a good tool for others to use in determining if a house was undersold. You can give the Land Registry a list of addresses and ask them to give you a list of all houses that were sold within a set period of time (ie 1 year before and 1 year after a specific date)
M