Tory whips are working overtime to win round waverers as Boris Johnson struggles to rescue his flailing premiership. Among the arguments being deployed to keep the beleaguered premier is that Brexit could be endangered – a claim which Johnson’s longtime Remainer critics like Lords Heseltine and Adonis are only too keen to deploy too.

So, as Tory loyalists seek to remind their colleagues about Johnson’s role in winning the referendum and getting Brexit over the line, what better occasion to do that than on the second anniversary of Britain leaving the EU?