You may need an indemnity insurance if the buyers solicitor asks for one. Some do, some don't. If you do need one they are easy and not too expensive - largely because no policy has never had to actually pay out!
Otherwise forget about it, but noting that It's really important you do not contact the council to ask about it. Once you do that you cannot then take out indemnity - should you need one - and you will be stuck with regularisation, or losing a sale.
Otherwise forget about it, but noting that It's really important you do not contact the council to ask about it. Once you do that you cannot then take out indemnity - should you need one - and you will be stuck with regularisation, or losing a sale.