Unless there's actually more detail than this it doesn't clear it up much - as someone asked yesterday does that mean one household can meet a single person from another - but if so, isn't the individual from the other household is breaking the rule then?
Either way, won't we then just have whole households 'individually' meeting up with other whole households individually - for eg, myself and my daughter could meet two friends from a different household separately but in actual fact meeting at exactly the same time and place - and that'd potentially be legitimate, cos there is nothing to say my daughter and I have to go out together etc. I mean that's an endless loophole, isn't it? It could incorporate many people from multiple different households meeting in the same place with a tiny bit of working out, too (SD party in the park!).
Maybe that's the point.
In which case they just as well say fuck it, meet whoever the fuck you like, just stay two metres apart.