My neighbour was planning a 6m rear extension and had applied for permitted development. There was neighbour's consultation and I had objected to the plans and the council rejected his application. Later he talked with me politely and said that he will alter the plans to be 4m on my attached end and 6m on the detached one. It seems an amicable solution and he reapplied with the new plans reflected on his application in the planing portal. Now having been granted the permissions, he is indicating his intentions to build 6m on my end which I had previously objected. I contacted the council and they are telling me that he has the right to do it although his application contained a different plan. The plan on his application is not relevant. I feel i have been tricked by my neighbour. The council seems to understand my situation but they cant do anything to stop him. I urgently need advice on what to do. He also has plans to build another 6m rear outbuilding and it is going to end up with a long wall on one side of my property which is unsightly.