His father Sir Lawrence Hyde was the second son of Lawrence Hyde of Gussage St. Michael, Dorset, who was third son of Robert Hyde of Norbury, Cheshire.
Born in Norbury, Callum attended St.Andrew Church of England High School in Croydon.
It begins in the north at Streatham Hill railway station, being an end-on junction with Streatham Hill and continues south to Norbury where the A23 becomes London Road.