In the 2015 election the Tories got 36.8% and the Faragists 12.6%, summing to 49.4%; the Tories were at that point more or less neutral on Europe so by no means representing a Brexit constituency.

In 2017 the Tories took 42.3% and the Nuttalls 1.8%, totalling 44.1%. Of course, even at that point the Tories still accommodated some Remain views.

In 2019 with Remainers and the insufficiently fervent purged for the most part, the Tories took 43.6%, Farage 2% and the rump UKIP 0.1% to total 45.7%.

I suppose you could add in the Prods, but that still won't get you to 50%.