The microfilm reel AIR 27/1788 at Kew which covers the ORB of No. 405 Squadron for 1943 starts with the following warning note (which I understand comes from the original volume before microfilming) : "Bound in this volume are copies of Forms 540 & 541 for 403 Squadron, February 1943 : the corresponding forms of the same date for 405 Squadron have been omitted.
H.R. Shelton
11th Jan. 1974."

Does anybody know where I can find the missing month ? Is there a copy somewhere in Canada ?