The law doesn’t say an age when you can leave a child on their own, but it’s an offence to leave a child alone if it places them at risk. https://www.gov.uk/law-on-leaving-your-child-home-alone
children under 12 are rarely mature enough to be left alone for a long period of time ‎· Размытое в синей футболке
children under 16 shouldn’t be left alone overnight ‎· Размытое в синей футболке
babies, toddlers and very young children should never be left alone ‎· Размытое в синей футболке