Hi Henk

I'm not aware if any the of following were on your 1939 list, but I have just come across these while researching at Kew:

4/9/39
AC2 Thompson 621154 149 Sqn Died of injuries following motor cycle accident Newmarket
AC2 Hoey 615404 149 Sqn AG - seriously injured in same accident

24/9/39
AC R.G. Davies 528576 144 Sqn. Died of injuries following road accident Scunthorpe

13/12/39
LAC Ernest John Naylor 567513 149 Sqn. Died in hospital following car accident on Epping New Road.

15/12/39
LAC John Travers Smith 520179 149 Sqn Died in hospital after being knocked off bicycle by car on Newmarket Road.

Hope this helps
Brian