It was made for a purpose, to alert the wartime civilian population to fifth columnists and infiltrators. Viewed through a modern lens, it is naive and simplistic but a thread of authenticity runs through it. The weapon handling and shooting are a bit feeble (have you tried firing a Lee Enfield .303?). Some of the dialogue is very dated and elements of the plot a bit far-fetched. All-in-all, it is entertaining and a reminder of simpler times.