Having conducted a 'safety video' search, and not having read of a similar incident previously, I thought I'd post this:

I was sat in 12B on Monday's delayed (cockpit window seal repair) BA155 LHR-CAI 777 service watching the pre-flight safety video when I noticed the video make reference to UD passengers.

A split second later a startled but alert Purser frantically waved her arms, and eventually dashed off in the direction of F, to alert the CSD to the fact that the 744 safety video was being screened in error.

So for the first, and so far only, time in my 40+ years of flying BA/BOAC I watched the BA pre-flight safety video twice.