The UK government's chief scientific adviser has said working from home is still the best option where possible to maintain physical distancing, as he acknowledged that the outcome of Britain's response to the Covid-19 outbreak 'has not been good'. Sir Patrick Vallance's advice during a two-hour appearance before the science and technology select committee contrasts with Boris Johnson's recovery 'roadmap' under which the prime minister is encouraging more people to return to their workplaces in an effort to help city centre economies recover