Rank refused to give it a wide cinema release in the U.K., because of issues with slang.
The Bofors was a Swedish-made anti-aircraft gun first designed in the '20s and used extensively by the Allies in World War 2. As O'Rourke points out, it was largely obsolete by the time of the Cold War scenario in the film, though it remains in use to this day.
The first cinema score of Carl Davis.
The cast had been drilled by Regimental Sergeant Major Brittian.
Shot in thirty days.