The UK rules change daily, it’s too complex to neither justify nor explain. Decision by committee.
Where I am the pubs close 10pm, you have to put mask on outside until you’re at your table, it’s table service only, staff take orders and bring everything - like a typical USA bar - to keep people from mixing.
Soon (my expectation) the next level is you can only go to the pub for a “substantial meal” which is open to huge interpretation, someone could order a meal, not eat it while drinking, then go home with it, so ordering rather consuming. The Government basically wants to stop people getting drunk and mixing up irrresponsibly and if you eat a big meal it’s then nigh impossible to get drunk, that’s the origin of the notion, but the law cannot affect the sequence of food-then-drink vs drink-then-food.
This pub has growlers to go, I had 2 pints in the place and took 4 pints home. I am wary of being drunk in charge of crutches.
I know how to make beer, if it comes to that. Not difficult, about 3 weeks elapsed from scratch.
In UK, if you wanted to stop the virus, lock everyone aged under 30, particularly any student, in their bedroom til April, they are the primary transmission right now.