[3] Craig was born in Poona, British India, the son of Donald Gregson, who served in the 3rd Indian Cavalry as a captain.
[7] Groomed as a star by the Rank Organisation, he appeared in a number of films, including Campbell's Kingdom (1957), Sea of Sand (1958), The Silent Enemy (1958), Sapphire (1959), Doctor in Love (1960), Cone of Silence (1960), Mysterious Island (1961), The Iron Maiden (1962), A Choice of Kings, Modesty Blaise (1966), Turkey Shoot (1982), Ride a Wild Pony (1975) and Appointment with Death (1988).
[9] Craig's television credits include Arthur of the Britons (1973), The Emigrants (1976), Rush (1976), The Danedyke Mystery (1979), The Professionals (1980), Shoestring (1980), The Timeless Land (1980), Triangle (1981–83), Tales of the Unexpected (1982), Robin of Sherwood (1986), Doctor Who (in the serial Terror of the Vervoids 1986), the Australian series G.P.
Craig's scriptwriting credits include the ABC-TV trilogy The Fourth Wish (1974), which starred John Meillon in an award-winning performance as the father of a dying boy.
[4] Alongside his co-writers, Richard Gregson (his brother) and Bryan Forbes, Craig was nominated for an Academy Award for the screenplay of The Angry Silence (1960).