Boris Johnson celebrated the moment with his close guard – with English sparkling wine and not continental Champagne – but without appearing. Big Ben, hooded for renovation work, did not make his mark on the event, to the great dismay of the most fervent supporters of leaving the Union.
Despite its historical significance, this date marks the opening of a transition period which should last until December 31. From Monday, Boris Johnson should begin to reveal his intentions for the tough negotiations that lie ahead.