People who come into contact with Covid infected to take daily tests instead of isolatingThe measure replaces a previous need to self-isolate if you were exposed to the virus Boris Johnson pays tribute to advisor who resigned over Downing Street party the government claims never happened CoronavirusAllegra Stratton resigned on Wednesday over a video showing staff laughing about the party the government insists never took place Christmas parties and school nativity plays can go ahead despite Plan B Covid measures, Boris Johnson says UK NewsHe made the comments during a Downing Street press conference 