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Cleaners, nurses, doctors, retail staff, binmen, utility workers, the building trades, etc. etc.

Just because programmers can work from home, doesn't mean everyone can. Programmers should definitely continue to work from home as much as is tolerable

They’re talking about a part of London where many people walk to work anyway. This just gives them more space and eases crowding on sidewalks. Also, not every job can be done from home.

Walk to work after getting off crowded busses tubes and trains

It's also not going to work because Sadiq Khan seems to have badly mismanaged public transport can't seem to run sufficient service such that the few people that do need it aren't all crowded together.