I agree - for £2 you can get an (unofficial) title register off the Land Registry website if you have the address - it will have all the restrictions/covenants on the property, as well as any possible rights of way, among other interesting tidbits. For a further £2 you can get the title plan which shows exactly what property is included in the title.
I punched in an address on a house we were interested in looking at and more than one title number came up. When I got all the titles together, it turned out that there was a rather large L-shaped piece of property that ran the length of the property we were interested in, and included a good chunk of land at the bottom of the garden. It also turned out that planning permission had been granted for this plot of land!
When we viewed the property and I questioned the estate agent, he said he had been told that planning permission had been refused. He was a bit shocked when I was able to show him (from the planning section of the Council's website) that the permission had indeed been granted, and that it would probably be very difficult to sell that property with the knowledge that someone else would be able to come in and build right behind their garden! I didn't have the details of exactly what had been approved, but that was enough to let this guy know I had done my homework!
