Children: Andrew; Maureen; Sean Keir (actor and producer); Deirdre Keir (child actress and producer); Julie T. Wallace (actress).
Although he played Kerwin Mathews's father in The Pirates of Blood River (1962), Mathews was three months his senior in real life.
He was considered for the roles of Dr. Hans Fallada, Dr. Armstong, Dr. Bukovsky and Sir Percy Heseltine in Lifeforce (1985).
Although he played John Cairney's father in The Devil-Ship Pirates (1964), he was less than four years his senior in real life.
After a days shooting of Blood From the Mummy's Tomb he replaced Peter Cushing when Peter withdrew due to his wife being taken seriously ill and subsequently died.