While the entertainment industry has been at pains to address issues of diversity in race, gender and sexuality, disability remains shockingly underrepresented. It’s not just that disabled actors are discounted for many roles. As actors and activists have pointed out, “blacking up” might have become taboo, but “cripping up” is still a shoo-in for awards. In almost 100 years, only three disabled actors have won an Oscar, compared to 25 able-bodied actors who have won for playing disabled characters.

The arrival this weekend of Wicked: For Good, the second part of a prequel story to The Wizard of Oz, has put the importance of authentic casting in the spotlight once more. The story of green-skinned witch Elphaba, and the prejudice she faces, Wicked is a celebration of difference. Yet since the hit musical opened in 2003, only able-bodied actors had played the part of Nessarose, Elphaba’s disabled sister. Last year, Marissa Bode became the first wheelchair-using actor to take the role, in part one of the film adaptation. The child Nessa is also played by a wheelchair user. The movies give........

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