Having a thread title that matches what you are actually asking for might help. Doing a search to see if anybody has already asked the same question would also be good - there are already several threads asking for advice on booking hotels during lockdown, such as
https://www.ukpunting.com/index.php?topic=284637.0Some hotels are definitely checking up on people, others aren't. For fairly obvious reasons, those who have found a lax hotel are unwilling to out them on a public forum. So you are probably going to have to take pot luck. And you and your guest are going to need some brass neck, as with so few other guests, you will likely be much more obvious than in normal times.
Oh, and you might want to avoid those hotels where they are putting the covid patients.
