Boris Johnson, who was supposed to be holding the briefing, after the Prime Minister came into close contact with an MP who tested positive for coronavirus.The government will be holding two press conferences a week as England remains under a national lockdown.The PM is due to host one of those each week, while other ministers will be drafted in for the second.However, following a meeting with Conservative MPs at Downing Street, Mr Johnson has been advised to self-isolate.It comes as MP for Ashfield Lee Anderson tested positive for the virus on Saturday.Mr Hancock will be standing in for the prime minister at today's press conference, which is expected to start at around 5pm.The press conference comes as the government announced plans to.