No idea why they would want to transfer a business out of their ownership for reasons linked to PIP, apart from concerns around their estate and so possibly a bit of estates planning.
There are tax consequences of selling/gifting a company to another person and how the persons are connected or not. E.g capital gains tax, gift holdover relief, inheritance tax etc.
There are also legal and accounting implications to ensure proper processes are followed and that the accounting rules are not bent to enact the substance over form rules.