Just listening to the official soundtrack of the opening theme to A Grand Day Out, the speed/pitch matches that of the Blu-ray, so wouldn’t that mean the Blu runs at the correct speed?
Was the soundtrack ever offically released?
I did a search for the soundtrack on YouTube myself and found this;
https://www.youtube.com/watch?v=ZDw40l-hsas
In the description, the uploader said he had to speed the audio up (from a source uploaded previously by another user) by 4% to make it accurate. Maybe that link you found was sourced directly from one of the 24fps Blu Ray audio?
I have no idea, i just assumed it was but can’t find anything of it. But the theme sounds more correct with the audio sped up in the linked video.
The strange thing is though on the most recent showing of The Wrong Trousers on the BBC, it matched that of the Blu-ray audio, with the slowed down pitch, so even they are showing the incorrect version!
I have the Blu-ray, so just wondering how i can rip those files and correct the speed/pitch? I do have a Blu-ray drive.