Find a new place to live. Hand in notice. Then tell him no to viewings, photos or any of his sale shite. He'll sell it no matter what and you'll have to get out or negotiate a new tenancy. We had ONE offer like this and of course the cheeky cunt wanted to jack up the rent. Fuck off and go through the hassle and expense of finding a new tenant then. Not our problem.
We did this every time with no problems. Just CBA'd with strangers traipsing through our home poking around at all our stuff, photos of our home and things online, keeping the home pristine for someone else's benefit or being scolded for having moving boxes and half-taken down furniture about, etc. so would just change the lock barrels, find another place to live, hand in notice and tell the LL no, they could wait till we left in a month.