PIP will provide you with a free* PIP Vault you can give to your potential vendors there and then on the valuation, while still on the sofa. It's exactly what Auctions use and gives the seller and yourself, then the solicitor something to put relevant documentation in from the very start.
You can then allow selective access to potential buyers and ultimately the buyer's solicitor. It's easy to use and free*.*fee of £25 payable on success only (exchange of contracts) which has been waived until 01/04/2021, so you can evaluate the benefits at no charge.