I haven't checked, but didn't Hank say he came up with the intro to Apache during The Shadows At Sixty documentary? What a legacy!
I have often thought there must have been more to the old story of Jerry Lordan, with his ukelele, on the tour coach humming the rudimentary tune to the assembled company within earshot! One would imagine that FD&H (Lordan's publisher - later taken over by EMI Music Publishing) must have been involved in the process at some point, in addition to the existence of the Bert Weedon recording.
It would be nice to think that demos/tapes, unsolicited or otherwise, were archived for posterity, but it is probably more likely they were lost or disposed of back in the mists of time, if not purchased by or coming into the possession of collectors of such items!
Bill