I don't deal with the money, I only answer questions. You appear to have paid a deposit of about 25 quid unless you have signed up for a monthly subscription.
That £25 is split 50-50 with me and the site.
I think that what you are looking for and what the buyer is looking for does not exist .
here I am,property solicitor telling you. Your own research, says the same.
The act of Parliament, says the same.
All the solicitor needs to do is ring the local authority.
It seems that whatever you come up with in writing , by a solicitor will not accept it .
This is almost like, you will come up with the act of Parliament and they are saying that they don't care what the act of Parliament says, they do not believe it !
I would probably start to look for another buyer if neither you nor the buyer want to pay for the indemnity premium .