From conversations I've had, and from what I've read on here, I think there's still loads of (understandable) confusion around the Christmas bubble concept. So household A might be meeting 2 other households between 23rd and 27th, perhaps lunch with household B on Christmas day, then drinks with household C on Boxing Day. But while households B and C both count A as one of their households, they don't know each other and have a different third household each - D and E. Sorry, complicated but can't think of a clearer way of describing what I mean.
Anyway, my point is that the repercussions of Christmas could end up being worse than expected as even more households get together over Christmas as they don't understand that the 3 households should be fixed? I've looked up the gov guidelines and they are not clear at all.
YABU - Everyone understands that Christmas bubbles are fixed with the same 3 households.
YANBU - People are choosing their own differing bubbles as described above.