- Knighted in 1970
- Son of Enrique Carreras (1880-1950), co-founder of Hammer Films and the Blue Hall theater chain.
- Father of Michael Carreras.
- Educated at Stonehurst. Left school, aged 16, to manage the Oxford cinema in Manchester. Served with the Honorable Artillery Company (HAC) during World War II. Awarded an M.B.E. in 1944 and promoted to the rank of Lieutenant-Colonel by 1946.
- Judged the success of his films not by critical plaudits, but strictly on the basis of box-office returns.
- Co-founded the studio Hammer Horror with William Hinds.
- Owner of Clarion Films Ltd.
- His 1909 birth registration lists his first name as "Jaime", a given Spanish variation of James.
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