Not sure about the England, Wales and Scotland but in Northern Ireland if you are dining out in a restaurant/bar (and I assume it applies to coffee shops too) you are only allowed to dine with six people and it must only be with one other household, e.g if I were to bring my friend I couldn’t bring my sister as my friend lives in a different household to both of us and she’d be there.
Anyway, how do restaurants verify this? I could literally book a table, walk in with 6 people from 3 different households and they’d be none the wiser