The BBC broadcast an episode of Dad's Army that had the colour restored. Thing was, the original recording was in colour but it was one of the episodes that got recorded over to re-use the tape.

The only extant copy was in bw. But the clever bit was, although the copy was bw it contained some info about the colour layered into it. Some clever person managed to resurrect the colour. OK, it wasn't brilliant, but it wa a lot better than colourised prints that were filmed in pure bw.
I agree about the Laurel and Hardy stuff. Nice idea, just didn't work.

But as technology progresses who knows.....