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Mr. Duncan Smith plays his father in the production, singing in a barbershop quartet of former Tory leaders. He also stars as Mr. Blair’s former spin doctor. Alastair Campbell.

Chris Bush says the elder Mr. Duncan Smith has been to see the play and offered his approval.

“We’re not out to vilify Tony Blair or anyone else,” the writer-director says.

“Everyone comes in for a certain degree of ridicule, but none of it is cruel or particularly aggressive. … I’m far more interested in making something entertaining.”

Both shows have received warm reviews from critics. Scotland’s Sunday Herald newspaper said they offer “instant nostalgia — back to the glory days of New Labour before that rather solemn interloper took over.”

Blair was always a showman, with a twinkle in his eye that suggested it was all a great big joke,” the review continued. “His mannerisms and rhetoric were made for comic opera.”

The Times added: “The fact that people keep making dramas about him is surely the best evidence that Tony Blair turned politics into showbusiness.”