This isn’t a debate about what rules there should be or not be at Christmas, and whether or not people should or shouldn’t break them, but let’s assume that it’s likely we’ll be back to some form of ‘the rule of 6’ for Christmas, maybe not including children in the number, maybe it’ll be 8 instead of 6, who knows, but its unlikely to be the normal course of events.
In practice, many people will break these rules to at least some extent, and is there really any chance of it being policed anyway? The police literally won’t have the resources to go and check all the houses that may have too many people in them and it would be a waste of their time And resources anyway when I’m sure they’ll be needed more elsewhere. Perhaps if there’s a massive party somewhere it might be worth it. But ultimately there will be no policing of the rules so it’ll be up to each person/household what they choose to do anyway surely?