A social sextet,
multiplied by two metres:
twelve square metres
n.b. I think that you’ll find pub tables ain’t quite that big…not that anyone is counting, so “one metre plus” is fine as well. I checked with the BBC.
The scientific evidence for physical distancing is published in the British Medical Journal, but it suggests we are not far enough apart. Which makes sense when you realise you can smell someone exhaling strawberry fumes from an electronic smoking device from a car park and a half distant. (What is it about those things? Why not just suck a lolly pop?).