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Hi thank you for your message, please note that I will look to provide an accurate but nevertheless speedy reply to your inquiry. I am sorry to hear about your situation but I will endeavour to help you today.
There is a lot of information there but I will try and address all the points, in essence no they did not break any laws not informing you about their building plans, that is something that should have been on the council's planning application website. In relation to removing the fence, if this is on the border it depends whether it is their fence or yours. If it is their fence they can remove it. The only thing they cannot do is trespass over the border onto your land. If you feel they are over the border you can try and bring a legal claim for trespass. I trust this assists
You do not need a letter confirming you deny access, you have already confirmed to them you deny access. Whilst your objections to the build are irrelevant they have planning permission. Loss of light is a planning consideration but they have planning consent so it is to late to object on those grounds now. They can build up to the border. Your only complaint as I say would be that they have gone over the border. With all this in mind a letter would essentially be:
Re: Building works at [insert address]
To confirm we do not give permission for you to access our land for any reason whatsoever related to your building works. We also object to your building plans in general but note you have planning consent for the works and therefore, can legally proceed with the works despite this.
We also object to the removal of the fencing and posts from the boundary line, please restore the fence to the border as soon as possible.
I trust this assists
They can build up to the border. I trust this assists
They can't. In that case you will need to write:
We also object to the removal of the fencing and posts from the boundary line but note you can build up to the border.