“I have but one question for you tonight, London,” bellowed Calvin Harris midway through his skull-rattling set. We were all ears. “Are you ready to go off?”

To be honest, nobody was entirely sure whether they were “ready to go off” or not, since nobody had the faintest idea what he was talking about. The bewildered response was a collective shoulder shrug.

He may talk gobbledygook but Harris, dressed as a Scottish hoodie, is a formidable live proposition, rediscovering what The KLF christened stadium house, while adding healthy doses of Utah Saints, The Human League and even Jean-Michel Jarre.

Each song, be it relative staples such as that homage to hedonism The Girls (“I like them big girls/I like them skinny girls”) or the more recent Ready For The Weekend began in grandiose, keyboard-heavy fashion, before lurching into a cacophonous, fist-waving frenzy and finally settling down into a pounding groove.

It’s as authentic as nylon but it’s as irresistible as oven chips and his recent Number One, I’m Not Alone, suggested that while Harris is certainly here today, he may not be gone tomorrow.

Strangely, as with the impressively droll support act Mr Hudson, there was no encore, which seemed rather churlish after a brief but rapturously received set.

Then, to everyone’s further bemusement, it really was time to “go off”. That’s “go off” home...