(Oops, meant Preview, not Post)
You will have to pay to get the info (�3, I think)
If it isn't registered, your own deeds will have a lot of info. Your solicitor or building society probably have these.
After that, old maps are usually interesting; I have one from before my house was built, it used to be allotments. These can be seen online, or often come up for sale on ebay.
If you are motivated enough, the county records office may have loads about your locality and quite possibly your house. These are usually free to access, but the drawback is you have to go in person and find it yourself, in office hours.