Hello Alain,
I had a quick look in Fledgling Eagles for squadrons in support of the British Expeditionary Force. Initially there were 4 and 13 Squadrons in 50 (Army Co-operation) Wing plus 2 and 26 Squadrons in 51 (Army Co-operation) Wing. 16 Squadron was added in the end of April 1940.
Regards
Peter
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