Boris Johnson had barely finished telling the nation about new English lockdown arrangements on Saturday night when the BBC, correctly reading the mood of its primetime audience, cut live to Strictly Come Dancing.It is easy to imagine Johnson on the other side of that switchover. There is a parallel universe where “Boris” is one of the sequin-clad celebrities waiting in an Elstree studio for the jaunty music to strike up while someone with natural gravitas delivers the serious message from Downing Street. In this scenario, Johnson’s political career fizzled out after a second term as mayor of London but his fame stayed alight. He was an obvious match for Strictly. (The judges deride his shambolic dances and dishevelled appearance, but he appeals over their heads to the voting public, who keep returning him to the dancefloor – for a laugh: a welcome distraction from the pandemic.)