Unfortunately though, many old properties are not even on the land registry (ours was not, nor our neighbours) so deeds are the only evidence. If this is the case for yourself and your neighbour and the deeds of yourself and your neighbour don't relate to each other or show discrepancies then the only way forward is come to an agreement with your neighbour and register the houses. You need to do this before putting it on the market to save any complications.
Our deeds show our house as is was in the 60's. No amendments have evere been made to the drawings. We bought our house in the late 70's. We only registered it with Land Registry when we took on additional mortage in the 1990's, and even at the stage of registering (which the Building Society did for us) the 1960's drawings were still used. Land Registry make no guarantee that drawings are accurate and say they can't be used as legal evidence.
So as I said earlier if the outbuildings have been used by you and assumed to be on your land, and this has not been questioned by neighbours, for 10 years (it has changed from 12) then they are yours by adverse possession regardless of what is shown on the deeds or the land registry.
It all makes a mockery of solicitors searches in my opinion. Money for old rope!!