L
Leofric
If there is no T indicating ownership of this boundary wall on the deeds plan there should be some clause stating that in these sort of situations the wall/fence is mesne and in this case you share responsibility for maintenance with your neighbour. I have not long ago been involved with this sort of situation with the maintenance of fencing /walls around a parking court my house shares with 2 other houses where the fencing/walls abut two houses outside the parking area.