The Land Registry doesn't appear to be a definitive Registry of Land!! Our village hall had a dispute a couple of years ago when a new housing estate was built on adjacent land, and the owner of the nearest house found the lean-to greenhouse he wanted to put on the back of his garage overlapped the ancient boundary line... so he just planted a new hedge around it, taking a strip of our car park. We got all the plans from the Land Registry, which showed an undoubted straight line between 2 points, and used a laser marker which showed that he had strayed 3 feet onto our property.
But the Land Registry shilly-shallied, saying that the line "hadn't been tested" -- ie, until the dispute had been taken to court and a ruling made, they were only holding on record what ONE party (the builder) had put on his plans. Because our hall had been built some years before compulsory registration of plans in our area, there was no definitive record of OUR boundary.
Fortunately we didn't need to go that far, as our insurance paid for a lawyer to wave a big stick in the householder's direction, and he backed down (and soon after moved away!!)
GRAEME ALDOUS Yorkshire