Hello all,
Just had an official response on the issue from Studio Canal:
"We recently discovered a small audio synch issue within a couple of scenes of the ‘Dracula Prince of Darkness’ discs that were released on the 5th of March.
This problem occurred at the authoring stage where a fix was not implemented despite being supplied.
With this in mind we will be replacing any discs that have this issue present.
Please send your proof of payment and your address to enquiries@vdcgroup.com and we will endeavour to send a working replacement to you promptly."
If you're discussing this issue elsewhere on the net, please feel free to pass this information on.