Our neighbours in our adjoining semi detached house want to remove the chimney breast in one of their upstairs bedrooms and also extend out the back. They have planning permission for the extension but have never discussed their plans with us other than briefly to my DH whilst he was loading the car up for us to go away over Christmas. This is despite us being on generally pleasant terms... I am aware of the need for Party Wall Awards for both items of work and understand the timescales involved and the process but what happens if they just commence work? I understand that this will mean there will be no agreed baseline condition which leaves them exposed but is there any form of legal recourse? Thanks