Covid-19 alert level across the UK is to be raised to Level 4 for the first time since June after the number of positive cases soared in recent weeks.In a joint statement, the chief medical officers from Scotland, England, Northern Ireland and Wales agreed that the risk of transmission is now “high or rising exponentially”.Their decision follows a grave warning from leading scientists that the UK could soon see 50,000 news infections a day if no action is taken and signals that tough new