(It was found by Phil Morris when he recovered 9 or 10 missing Doctor Who episodes.)
And for the thinkers: the audio had been recorded by someone at home with a line-out on his TV on reel to reel tape. Obviously the optical audio on the film itself could never have been recovered to anything useful enough.
There is no reason why this should not work for 35mm movies as well.
http://www.bbc.com/news/av/technology-4 ... -lost-film" target="_blank" target="_blank" target="_blank
Morecambe and Wise: Rescuing a 'lost' film
An old BBC broadcast of Morecambe and Wise from 1968 has been restored using a groundbreaking new technique.
Once thought unsalvageable by experts, the badly damaged old film was scanned using X-rays, then an algorithmic reconstruction method was used to digitally reconstruct the images.
Now they have 30 seconds of restored film which can be seen for the first time in decades.