Pete,
I have a copy of the ORB as a whole, before TNA decided to split these documents into tiny chunks as a revenue earning exercise.
Unfortunately it is as you have found it. One page for April 1940 stating the record for that month had been lost, four pages of F.540 for May but no F.541 and two pages of F.540 for June. There is a single page of F.541 for June but it just records "No operational flying carried out by this unit during the month of June 1940."
There are Appendices, but these stop at March 1940 and do not resume until October 1944 ! Very frustrating for anyone trying to research this squadron for this period.
Sorry not to have had any better news.
Regards,
Martin Gleeson.
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