The War Office asked "Ealing" to make a feature length training film for them on the subject of security, but provided minimal funds. "Ealing" more than doubled the budget from their own resources, to produce a film whose appeal transcended its military function. The very large profits from commercial distribution went first to repay this outlay, then to the War Office rather than "Ealing."

Winston Churchill wanted to ban this film because he considered that it would demoralize audiences.

When Mervyn Johns is waiting in the bookshop he stands by a photograph of a nude in the magazine L'Art Catalan. The girl in the picture is hardly Catalan, and it is surprising the censor passed it. Also when the stripper comes down the stairs during the performance, she passes a large silhouette of a nude. The censor was clearly asleep.

First film of Victor Beaumont.

The title is taken from the British war casualty announcements "...the next of kin have been informed".

Released in May 1943 in the United States by "Universal Pictures" as "Next of Kin." The movie was cut for the American release, which included filmed segments featuring FBI director J. Edgar Hoover talking about the need to guard against enemy spies in wartime.

William Walton: Soldier at security briefing.