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Wait, why are we talking about 'essential' and 'key' workers / businesses at all then? It's more of a specific reduction of any business with direct people contact, everything else just goes ahead as usual. Reading what people are saying online e.g. on reddit, it also does not seem many businesses are taking a lot of precautions with regards to social distancing at work, disinfectants etc....
Yes. It's only Retail, Hospitality and Leisure that are shut down. Working in other people's homes (other than maintenance/repairs) is also out.