 Ambler handed over command to Air Commodore Finlay Crerar in June 1943.With his rank as an air commodore confirmed Ambler moved across the road at RAF Bentley Priory to an appointment as the Deputy Senior Air Staff Officer (DSASO) of RAF Fighter Command and then the Senior Air Staff Officer (SASO) on 1 February 1945 in the rank of acting air vice marshal.Between August 1943 and October 1944 Ambler was an Aide de Camp to King George VI.