Thanks for your email.
There is a potential right of light issue here. Unless there is a provision in your deeds where your rights are reserved for the benefit of the neighbouring land.
Sadly, a council may not take this into account when assessing a planning application.
There are guidelines in respect of this and a surveyor can determine if the proposed development, if at the planning stage, or actual development, if constructed or in the process of being constructed, would interfere with your rights of light.
If the surveyor determines that the development will infringe your rights you can apply to the court for an injunction to prevent the development taking place. Do note that the court does not have to grant an injunction even if the development will/is interfering with your right. It can award compensation.
Your first step will be to instruct a right to light surveyor, there are a few specialist firms you can find on Google.
If you feel that the development is not in accordance with the plans do report it to the council. They should come and inspect to ensure the development is consistent with the permission. If the council will not do this you can get a surveyor to carry out a review.
Good luck. I hope ny answer is helpful.
Please remember to accept/rate my reply.