[Neil Jones]

Yeah that 1963 series was only aired once and was never seen again.
The story on Wiki seems to suggest Hancock had his own copies of that show (ATV probably wiped it which was the norm at the time) but their existence came to light after a death in the family and that's where Kaleidoscope probably became involved.

Network did release other Hancock material in their time.

Nice to see that Rewind is happening, maybe it'll spur "Network 2.0" to pick the mantle up, though if it hadn't happened by now, it probably never will do.