18 May 1940
Unfortunately, there is no concrete detail on the events of this day. At most, the ORB indicates the preparation of an escort mission, for the benefit of Bristol Blenheim at 04h00, which is canceled; while Brian Cull [1] mentions a brief confrontation with Heinkel He.111 of KG 1 without further details.
[1] CULL, Brian ; LANDER, Bruce ; WEISS, Heinrich. Twelve Days in May. The Air Battle for Northern France and the Low Countires, 10 – 21 May 1940, as seen through the eyes of the fighter pilots involved. London : Grub Street, 1999, p.225.