We’re a third of the way through the fabulously camp production of Wicked Witches, a mashup of Wicked and The Wizard of Oz, at the Pleasance theatre in Islington, north London . Dor (formerly known as Dorothy) and Tin 2.0 need guidance on how to take down the Wicked Witch and save the borough of Oz-lington from a great blizzard.

But wait! Who’s that Facetiming? It’s only Jeremy Corbyn , the wise Wizard of Oz-lington! The 200-person audience cheers and applauds the Islington North MP, who looks as if he’s beaming in from the allotment.

“It’s me, the Wizard,” Corbyn says. “I’ve been very busy planning a party, a new party. It’s harder than it sounds.”

Shortly thereafter, we’re treated to an even battier on-screen cameo: Sir Ian McKellen as Toto the dog, complete with a pair of furry

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