I used the collection at the U.S. National Archives in Washington and at the Air Force Historical Research Agency at Maxwell AFB in Alabama. The earliest reports in this collection date from around mid-1942 and there are no photos. The earlier material from the B of B period would be (or should be) in the AIR 40 files at the British National Archives (formerly the PRO) in London. I recommend you go to London sometime and take a look as I am pretty sure you will find what you are looking for.
L.