I've noticed several people using Richard Osman as a unit of social distancing which is a useful aid to visualising these things – however there's more to it than simply "Imagine Richard Osman Hovering Horizontally Between People".

To make sure this model is fully accurate, you have to imagine yourself surrounded by a horizontal circle of Richard Osmans.

Furthermore, you have to imagine everyone else also surrounded by a horizontal circle of Richard Osmans.

Social distancing means that while your circle of Richard Osmans can touch someone else's circle of Richard Osmans, no-one can come within someone else's circle.

The shell of Richard Osmans also extends upwards – worth bearing in mind even though people are less likely to enter your personal space from above.