Boris Johnson has announced that 'Covid marshals' will be sent out to make sure the public follows social-distancing rules.They say this is to help local authorities support social distancing in towns and city centres.The Prime Minister announced the latest measures when he updated the public at a government press briefing on Wednesday (September 9).He was joined by Professor Chris Whitty, Chief Medical Officer for England and Chief Scientific Advisor, Sir Patrick Vallance, for the first public