Update....(posted 7886 days ago)I got a very supportive and positive response from the guy who bought the house the same as mine, at the same time my house was sold.
He paid a few thousand more than mine was sold for. My own house also had various improvements ie; £10,000 consrvatory and prof landscaping. I know the conservatory wouldn't add on the full £10,000 but even if it added half that amount I reckon I now have some proof of the Abbey underselling.
M