Old pals Ewan McGregor and Michael Grandage prepare for their new play, My Master Builder, by chuckling about everything that could go wrong and has

For today’s Observer New Review I had the not-exactly-onerous assignment of spending an hour with the actor Ewan McGregor and director Michael Grandage, as they prepared to put on a new play, My Master Builder, in London’s West End. The two men go way back, and mostly they were cracking each other up with knockabout old stories – much of which there wasn’t room for in my article. McGregor recalled one of his first roles on stage, as Orlando in As You Like It, and how when Simon Callow – multiple Olivier and Bafta award winner – played the part in 1979, he walked out on stage at the National Theatre only to promptly forget the first line of the play.

“If you’re a woman and you’re about to have a baby, everybody tells you nightmare stories about childbirth,” said McGregor. “And when you’re an actor about to do a play, everybody tells you terrible things that have happened on the stage.”