Not checked 1940 Squadron ORBs so these RAF aircraft are unconfirmed, but reputed to be linked to the Low Countries / France.
13 June, 142 Sqn, Battle.
13 June, 82 Sqn, Blenheim.
14 June, 226, Battle.
----------
Added:
12 Squadron
14 June, Battle L5383
Sgt R J Willcox, Sgt J Hislop, Sgt G H Emery, crashed during operational flight at Pacy-sur-Eure, France.
21 Squadron
14 June, Blenheim Mk IV.
Seems to say two aircraft (note the Serial numbers of the aircraft are missing their letter prefix).
3742, P/O Saunders ; Sgt Eden ; Sgt Webb - Fate unknown.
88 Squadron
13 June, Sgt Haywood ; Sgt Jones, shot down and both admitted to SENS Hospital.
103 Squadron
14 June, Sgt Brumby ; Sgt Hedley ; LAC Werner.
Shot down in an Orchard, near
Laval.
RAF Squadrons mentioned in France in 19401 ; 12 ; 21; 73 ; 88 ; 98 ; 103 ; 226 ; 242.
9 ; 17 ; 40 ; 150 ; 501 (from internet)
From memory 114 or 116 in an ORB?
As you go through the ORBs, note any
other Sqns mentioned.
67 Wing and 76 Wing are mentioned in Squadron ORBs whilst in France in 1940
67 Wing
https://discovery.nationalarchives.gov.uk/details/r/C4097480There are some references to Wing, Aircraft BAAF AASF some telephone Logs, etc., in files in AIR 35
RAF Wing ORBs are usually in AIR 26
Don't forget the Army and RNAS (Royal Naval Air Service) have aircraft too and their own back-up staff.
A lot of personnel evacuating went by road and once evacuating the aircraft they flew back, would have been in front.
The Service Record, or correspondence sent after the loss occurred will have reference to Units.
My Grandfather's RAF Certificate of Discharge (sent about 3 months after his death in WW 2), has the Units he was attached to, with dates.
-------------
These cover the RAF Casualty Files released into AIR 81 so far for 13 June 1940
https://discovery.nationalarchives.gov.uk/results/r?_ep=13%20June%201940&_cr=AIR%2081&_dss=range&_sd=1940&_ed=1940&_ro=any&_st=adv14 June
https://discovery.nationalarchives.gov.uk/results/r?_ep=14%20June%201940&_cr=AIR%2081&_dss=range&_sd=1940&_ed=1940&_ro=any&_st=adv