Is anyone else searching for this currently?
From The Lost Media Wiki
Hi there, I was wondering if anyone else is currently searching for this. There are four of us on my Discord server searching for it currently. If you would like to join and help the cause here it is: https://discord.gg/ZDwmvj. Currently we have contacted a variety of sources, including Aardman themselves, the BFI, the two sound editors for the film and many others. Please join if you are interested! Thanks!