Understanding stay at home directives and self-isolation

It’s almost a month since the UK Prime Minister Boris Johnson announced a strict “stay-at-home” order to prevent the spread of coronavirus. Right now the nation is under police enforced lockdown and people are allowed to leave their homes only for very limited purposes such as shopping for basic needs, medical necessities and traveling for work purposes. One form of exercise a day, like run, walk, or cycle is also allowed. It is also necessary to keep a 2-meter distance when you go out.