Sphere Media, a Canadian TV and film producer, has secured the rights to Dancing With Diana: A Memoir by Scottish/Canadian dancer Anne Allan, who was Princess Diana‘s top secret dance teacher and co-choreographed a legendary Uptown Girl routine at Covent Garden for her. And Glasgow-based Two Rivers Media and Sphere have struck their first co-production deal to make a 90-minute feature documentary based on the memoir, published last year, they said on Wednesday.

Sphere Abacus will distribute the documentary globally.

“The documentary will chronicle the nine-year period from early 1981 when Allan served as Princess Diana’s private — and top secret — dance teacher,” according to a description of the project. “Over hundreds of weekly one-hour lessons at a private dance studio, teacher and pupil forged a close friendship as Diana negotiated stratospheric fame, the joy of motherhood, her crumbling marriage and her struggle with bulimia. In her role as confidante as well as teacher,...