I went out a few times when the Eat Out to Help scheme was running and ended up mainly at a Wetherspoons pub. I can tell you now the staff there took no chances and if a group turned up of more than 6 and tried to sit on tables next to each other, they would be politely asked to either move to a different table far away, or get out. I also remember there were times when people got really drunk and were walking over to tables with people on they knew (but hadn't came in with) and the staff promptly asked them to go sit back down or leave.
One night someone got quite aggressive and irate, we upped and left before anything too scary happened. I think the police were called and no one was luckily hurt.