Thanks Faenor. I think the Hurricane "W" is 73 Sqn., she had a distinctive white tip to the fin, 35" cocardes and 30" letter (see photo here dated April); the ORB records "W" several times then, regular pilot was P/O R. A. Marchand "B" Flight (killed later in Battle of Britain). Unfortunately could't find the serial. In the photo it's in the small-style but just visible.
https://www.facebook.com/photo.php?f...04092911722407
Nick