Swinging the thread back onto a Bluebird kind of heading, it's cool to think that not only is it Bluebird that is still very much alive and well, but that to some, Gnat XM691 is still along for the ride too! I mean, if a new-build 'Spitfire' can claim an original identity from just a data plate or a few other small original components, then by that logic the Gnat's tail fin carries it's own identity/history still too. Though, it's not actually being part of a Gnat anymore, so perhaps it doesn't count!
I wonder if K7 for a time had a silver tail fin with the RAF fin flash painted on it, before she was painted blue for the last time? As per sister aircraft XM693 here-
-and here's Bluebird's tail fin on display at Farnborough in 1960, while still attached to XM691-
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