The British Board of Film Classification (BBFC) has slapped a trigger warning on the blockbuster hit Wicked for discrimination against a “green-skinned woman”.

The new movie musical, adapted from the popular stage show, is a prequel to the 1939 classic The Wizard of Oz that follows the untold story of the Wicked Witch of the West and Glinda the Good Witch.

The plot documents the friendship between Elphaba, a misunderstood young woman with green skin played by Cynthia Ervio, and Glinda, a…