Grint will appear opposite Shaun of the Dead actor Nick Frost, and Hollywood film star Don Johnson in the show, produced by David Walliams and Miranda Hart's production house King Bert, called Sick Note.
The broadcaster announced in November that it had commissioned the adaptation from Bad Wolf and New Line Cinema.
Philip Pullman’s epic fantasy trilogy has sold close to 17.5 million copies around the globe and has been translated into more than 40 languages.
Churchill’s Secret - ITV
This one of TV film stars Harry Potter actor Michael Gambon as Winston Churchill. In 1953 Winston Churchill has the first of several strokes which was kept secret from the world. Told from the perspective of his young nurse, Churchill fights to recover, all the while holding tight to the reins of the nation, refusing to relinquish his Prime Ministership.