Thanks, Charlie. I agree that it's the closest fit so far to my Hampden. The "UD" codes might be a typo or other error. However, it still may turn out that the "UD" codes really did exist for the Hampden. Several Coastal Command flights used the Hampden and I do not know if any of them used two-letter codes.
I have Michael J.F. Bowyer's
Bombing Colours, which seems to have all of the Bomber Command Codes, including those of the Operational Training Units and other such miscellaneous outfits, but I do not have any equivalent book on the Coastal Command. There is a very useful RAF Coastal Command site (
http://www.rafcommands.com/Coastal/indexC.html), but it does not provide squadron codes.
Anyway, I am doing this as a strictly "out of the box" build and will be satisfied if it ends up looking like an airplane, even an imaginary one.
Don