For those who are interested, latest in the series is out:
https://www.amazon.co.uk/FOCKE-WULF-...s%2C149&sr=8-1
Don't expect an in depth study rather a good selection of photos with as full captions as possible.
Osprey's Do 17 Combat Units is currently at the printers as is Frontline's Air War Archive on the Fw 200 and Bf 109: The Later Years. Finally, I have today finished the text for Classic/Crecy's Do 17: The Flying Pencil at War. 58,000 words and photo count will be over 500. Due out back end of this year