Dang, Whamageddon!
I think there's been at least one classic Dr. Who series released on blu-ray from 16mm film which makes it look distinctly better than anything which survived on tape from the Great Erasing.
The one I remember hearing about was The Daemons (Chap with wings, five rounds rapid), not sure if there were any more.
The reason science fiction TV show "Babylon 5" has never had a blu-ray release is because while the space sequences were ahead of their time for the day, they've aged so badly they'd look like Playstation 1 graphics and would need completely recreating from scratch to stand up in high definition.
Whereas effects from Kubrick's 2001 still look marvellous.