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I also know there were several Marks of UBCs and am not sure which one(s) would be correct for my late 1944 model.
Think your on the right track Andy, will have time to go through a few books tomorrow, you never know something might turn up !I did a screen capture of a drawing posted at The Secret Mosquito Stash | Military Aviation | Air & Space Magazine
Though for a bomber version, it stands to reason that this could apply to the FB VI rear bomb placement:
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Thanks very much Graeme. The thing that this thread revealed to me is the myriad of "Universal" carriers!