Thanks for the warm welcome.
I dont think Honeywell have had anything to do with De Haviland. Honeywell only make sub components for aircraft, ie. engines, avionics, control valves, whereas De Haviland manufactured complete aircraft. On an interesting side issure, we do see drawings marked up "Hawker Sidley".
Yes I am sure you are right that any question will return an answer. There are some very knowledgeable people on this forum.
Paul