[Alex Smart]

Hi,
Not a 409 Squadron "expert" but have Air Britain book "The Defiant File" by Alec Brew.

409 Sqdn code "KP"

There is note on page 119 that may be of use.

Watson F/Lt. F.S. RCAF 409 Sqn 11.10.41.

Page 99
AA281
c/n 651
deld to 24 MU 2.6.41; 409 Sqn 9.7.41; Crashed at Wolverton, Norfolk after pilot lost control, 11.10.41; Flt.Lt. F.S.Watson RCAF killed; Flt Sgt. McKinnon baled out; SOC 16.10.41.

Page 39
No 409 Nighthawk Squadron forming at Digby on 17th June with thirteen aircraft arriving all at once on the 9th July.
and
No 409 flew its first operation on 3rd August and was declaired fully operational on 20th but the following month began converting to Beaufighters.

Hope this is a help.

Alex