The overwhelming evidence is that transmission is primarily amongst friends and family.
I've said time and again on these thread - when people say, why can I go to the shops, pubs, work but not visit my family - you don't hug the shop worker, the waiter, the check out person - but most people (apart from the perfect people who exist on mums net) do not socially distance properly from friends and family.
wen you leave the restaurant, you chair is sanitised (ok, I don't actually think that makes a difference but it happens) but then at home, if friends leave, you don't sanitise he sofa
hell, most people don't even stay 1m away from from friends and family
if you meet them in public, there is a chance someone will be monitoring it (covid Marshalls?)
So I think missing households in private will be the first to go