With different measures in each UK nation, localised lockdowns and a rapidly changing national picture, many Britons are confused about coronavirus restrictions – including, it emerged on Tuesday, the prime minister.Boris Johnson apologised on Twitter for having “misspoken” when asked about regional restrictions on socialising that are set to be imposed in northeast England from midnight.He sought to clarify that the “rule of six” limit on social gatherings in England does apply outdoors, after…