The three reasons why the Conservatives cannot yet assume they are home and dry

This is beginning to look like an election the Conservatives should not lose. The party has gradually squeezed the life out of Nigel Farage’s Brexit Party. As many as two-thirds of those who voted Leave are now backing Boris Johnson and his Brexit deal. That has given the party a double-digit lead in the polls that, if it transpires in the ballot boxes, should be sufficient to give the Prime Minister a comfortable overall majority.

So, what could possibly go wrong? There are three reasons why the Conservatives cannot as yet assume they are home and dry.

First, the party still enjoys the support of nearly one in five of those who voted Remain in 2016. Without them the Conservative lead in the…