coronaviruslockdown measures.Boris Johnson and his Cabinet were briefed on the spread of coronavirus and its economic effects on Saturday and the Cobra committee will be convened on Tuesday, Downing Street said.Senior ministers were briefed by Professor Chris Whitty, Sir Patrick Vallance and chief economic adviser at the Treasury Clare Lombardelli, No 10 said.The Prime Minister's official spokesman said: "The PM has been engaged with the Cabinet throughout this process."The Cabinet received a detailed briefing from the Government's chief medical, scientific and economic advisers over the course of the weekend."The PM will work with his colleagues to ensure that we respond in the most effective way to try to control the spread of the virus.