I can't see it making a lot of difference, 1m or 2m. People are going to get close, especially when they have had a couple of pints.
Anybody with the virus is going to pass it on, sans doute.
1 metre is actually quite significant, normally in a pub you’d be far closer than that whenever you go to the bar, and whenever you are sat at a table with others.
Not saying it’s enough, mind.
