A bit more of that Tonbridge School bio ... places him in the Middle East 1941-43..."Cameronians , 1940 ; Lieut . , 1942 ; Capt . , 1943. U.K. , 1939–41 ; M.E.F. , 1941-2 ; C.M.F. , 1942-3 ; L.F.G. ..."
There was an officer by the name of Adrian Harry Austin Gardner (130040) in the Cameronians. His substantive war rank was Lieutenant. Cashiered by sentence of court martial in February 1944. https://www.thegazette.co.uk/London/issue/36431/supplement/1316