Hi Jim P
Thank you for this ... this is completely new to me, and a quick Google gave me this:
http://www.luftwaffe-experten.org/stammkennzeichen.html
so I'm going to improve my knowledge for sure.
This page lists "CB+TL ... Fieseler ... Fi156 C ... rommel" so it looks as if you are right after all Boomerang.
Thanks again.
DK