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It is not the first time a Labour leader has used Lord Alli's property for televisual purposes - Ed Miliband prepared for leaders' debates ahead of the 2015 election in the barn of his house in Kent.

“That kind of televisual stillness — there’s objectivity,” he said, “which is exactly the opposite of what I was going after.”

But onscreen, as a marvel of televisual imagination and an example of a seamless integration of practical and computer-generated effects, the scene is unforgettable.

The very structure of televisual storytelling changed too.

Interested in expanding your televisual horizons?