Thinking about it more, you might be a bit nearer than you think. Although 2m is a radius, my understanding is that establishments that receive 'the unwashed public' actually mark out the space in a grid rather than circles so you do lose additional space in the corners and would therefore gain more by relaxing it... yes indeed, every little would help if someone was brave enough to just go with 1.5m like most other countries. Now the government has painted itself in to a 2m x 2m corner it can't get out of it because the media would demand cast iron guarantees that not one person would be affected and a vocal minority of the population would freeze in abject terror and accuse the government of premeditated murder.