Looks like a deft flick on by the government into the" health and safety at work" area.
The business has to decide whether extra costs are appropriate.
For a job where there's usually 3 in a van you could increase space by paying one or more guys to take their own car. Or you can take the risk that they get sick and sue for inadequate measures.
Either way the government has done its bit. (not morally, but they don't care about right and wrong).
I reckon this is a future bonanza for ambulance chasers. "did you get covid at work?"