The SNP's majority of 21 in Perth & Perthshire North would have been wiped out if just 11 people who voted for the SNP had voted Conservative instead. Not voting one way brings the majority down to 10, and then voting the other way creates a Conservative majority of 1.
Here are the next seven most marginal Conservative losses.
Had these seven majorities also swung to the Conservatives instead of Labour then the Conservatives would have had 326 seats out of 650, which is technically a majority. And for that to happen, what's needed is for half of those forming the majority to switch from red to blue.
Adding the switcher figures for all eight constituencies gives a total of 399.
399 voters choosing to back Theresa rather than the opposition would have raised Tory support sufficiently to create a majority Conservative government.
Caveat: Sinn Féin never turn up at Westminster, so the winning post is effectively 323. And 323 seats is a target the Conservatives could have reached with just 75 more votes!
However the figures fall, the fact remains that there are fewer than 400 voters on whose choice the outcome of this election hinged. If you changed your mind in Perth, Dudley, Crewe or Canterbury, one of those people could be you... and you changed the future.
