Whether or not Nigel is right (and I tend to agree with him - I seem to recall that explanation being given by some ‘expert’ on TV when distancing was first introduced) I will continue to try to maintain a 2-metre distance at all times. Where that may not be possible - e.g. when I’m shopping for myself and my wife’s octogenarian parents - I wear a face-covering and disposable nitrile gloves, and I’ll continue to do so into the foreseeable future.

Better safe than sorry.