Getting a hygiene certificate is actually pretty straight-forward if it came to that and supper-clubs have been going fairly successfully for a couple of years now without being shut down as far as I know. I like the idea. In the uk anything that gets people from different social circles together is a great thing - I don't think it happens as much as it should. Good luck to them!

They are there for good reasons, but they doesn't mean they are good. At least not in their current form.

If it's legal to have your neighbors over for dinner, but it becomes illegal if they pay you back, something's wrong.

That's not really what's going on here though is it? It's more like informal restaurant businesses, with the service acting as a directory and booking portal.

Not that I'm saying this shouldn't be allowed, but there are good reasons we have hygiene rules and it's at least worthwhile investigating how they ought to apply here.