At today’s Downing Street press conference on the ramped-up coronavirus measures announced for much of the north, Boris Johnson addressed the question of messaging.Until a vaccine emerges, he said, ‘the only real utensil we have for controlling the spread of this new virus is human behaviour’.“And the only way we can encourage people to behave in one way or another is through advice…We need to keep it as simple as we possibly can.”And yet what Greater Manchester, West Yorkshire and East Lancashire have been told to do over the last 24 hours doesn’t really fall into the category of simplicity or clarity.When the news emerged - late on last night, via Twitter and a Sky News interview with the health secretary - it was mired in contradictory.