Some of the logic on here and on the other thread is crazy. 'No, this won't change my plans, because me and everyone else I know have been pretty much doing what we want over the summer anyway, because we're fed up of Covid and we can't be arsed to read don't understand the rules, so we're certainly not going to follow this new bollocks rule.'
But the whole reason the 'new bollocks rule' has been brought in is because cases have gone up, which is happening because people aren't following the guidance in the first place. The evidence seems to suggest that social gatherings are the main reason for the increased spread. And yes, 6 might be a random number, but how do you have any chance of getting people to restrict gatherings without putting a number on it?