He then joined the National Youth Theatre, spending two seasons there and earning a scholarship to train at the British American Drama Academy.
On 12 February 2009, Bloom actively participated in the 'Australia Unites' fundraiser to raise support for the victims of the Australian bushfires on 7 February 2009.
However, when he was thirteen, Bloom's mother revealed to him that his biological father was actually Colin Stone, his mother's partner and family friend.
Bloom's mother, Sonia Constance Josephine (née Copeland), was born in Calcutta, India, the daughter of Francis John Copeland, a physician and surgeon, and Betty Constance Josephine (née Walker).
Through her, Bloom is a cousin of photographer Sebastian Copeland.
After being spurred into action following his school prize submission to panto actor Richard Sieben in 1992, in 1993, he moved to London to follow a two-year A Level course in Drama, Photography and Sculpture at Fine Arts College, Hampstead.