Will was slated to play Pennywise in It (2017), but was forced to drop out when production delays led to scheduling conflicts. He was replaced by Bill Skarsgård.
Is good friends with his "Narnia" co-star, Ben Barnes.
His mother was raised in an Anglo family in Kenya, where her own father, Jack Barrah, was a prominent game warden who helped preserve the Maasai Mara wildlife sanctuary.