If you ladies and gents haven't seen the Directories on this website yet, feast your eyes upon this list:

British Ambassadors (1880-Present)
British Armed Forces (1900-Present)
British Civil Servants (1900-Present)
British Colonial Governors (1900-Present)
US Senators (1863-Present)

The following options are given at the British Armed Forces link:

I Royal Navy- Senior Appointments
II Royal Navy- Captains Commanding Warships
III Army Senior Appointments

IV ROYAL AIR FORCE SENIOR APPOINTMENTS [1918 to present, with a chronological roll for each office]

V Ministry of Defence and Tri-Service Senior Appointments

All available at http://www.gulabin.com/ - see the contents on the left hand side of the main page.

Happy hunting

Steve