Sowerbutt's Secret

The Brigadier said: "I must ask you to keep all the events of the last few hours strictly to yourself. As a serving member of His Majesty’s Armed Forces, you are subject to all the provisions of the Official Secrets Act of 1911."
https://www.amazon.com/Colour-Red-Deal-Sowerbutt-Novels-ebook/dp/B00RL9FGKM?