Just found a pointer to this 2015 book, 'Mad Mitch's Tribal Law; Aden and the End of Empire' by Aaron Edwards, a Sandhurst military historian:
Mad Mitch was truly a man out of his time. Supremely self-confident and debonair, he was an empire builder, not dismantler, and railed against the national malaise he felt had gripped Britain’s political establishment. Drawing on a wide array of never-before-seen archival sources and eyewitness testimonies, Mad Mitch’s Tribal Law tells the remarkable story of inspiring leadership, loyalty and betrayal in the final days of British Empire. It is, above all, a shocking account of Britain’s forgotten war on terror.
Link:https://www.amazon.co.uk/Mad-Mitchs-...+and+of+empire