Singin’ in the Rain it will never be, but Trainspotting the Musical is not as improbable as it seems. The yellow-brick road from cult novel to film to blockbuster musical is so well trodden that it was only a matter of time before an all-singing, all-dancing adaptation of Irvine Welsh’s gritty 1993 novel about a bunch of heroin addicts in Edinburgh hit London’s West End. Danny Boyle’s 1996 film, which celebrated its 30th anniversary last month, had already established Trainspotting as a story with a soundtrack. The musical will have specially written songs too.

From Oliver! and Les Misérables to Matilda, Wicked and The Devil Wears Prada, many of the biggest hitters in the West End today started out as books. Even the global hit Hamilton was inspired by a hefty 800-page biography of the 18th-century American founding father Alexander Hamilton. Last........

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