This is a very common question.
If you want it in place, they charge you.
If don’t want it in place, they will remove it.
There is a reason and I have a personal friend who was in exactly this situation.
It is free storage!
I find it absolutely bizarre that they will remove it and then tell you that they will take you to court if you dispose of it.
You now need to send them notice to remove it within the next 28 days. Give them a date deadline not just a number of days. That way, there is no dispute when the deadline expires. The deadline has to be reasonable the courts of found four weeks is reasonable. I know they have had plenty of time, but you could have given them this notice (had you known about it) weeks ago.
Proof of posting from the post office counter and also send by recorded delivery.
You tell them that this is notice under the Torts Interference with Goods Act 1977 and that if they do not remove the scaffolding by the deadline, you will dispose of it and seek the costs of disposal from them, through the county court if necessary.
Tell them that if they are minded to issue court proceedings against you, you will produce this notice to the court as evidence of their unreasonable behaviour and in any event you are going to ask the court to award costs against them in respect of the legal proceedings.
You may find that a strongly worded letter from a solicitor threatening a court application and an application for costs, may focus the mind without actually the need to get to court.
Check your house insurance to see if you have legal expenses cover that would pay for the legal cost of taking this to court.
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