I've sent mine in.
My guess is that it is likely to be totally unacceptable since it involves aircraft: so I fear we will probably end up with something like a commemorative issue of postage stamps, followed by a celebratory cross-country run and parade at Cranwell.
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Not forgetting the inevitable ("Stars" Only) Royal reception in the evening of course : with a couple of very old veterans wheeled out by the organisers in order to make the other distinguished attendees feel nice and warm inside.
