Another quick look through those December 87-Feb 88 episodes, it looks like the ones with video location work are between the 21st December and 13th January, then it's back on film between the 18th January and 17th February, then being full time video from 22nd February onwards. Looks like they made three weeks' worth of episodes using video, then went back to film for a month before the switch became permanent. Doesn't look like it's director related (unlike with the cardboard vs electronic credits & endcaps we've seen on the 86/87 episodes, which did seem to vary by director), as according to Corriepedia it's the same directors working on both bunches of episodes.
Similarly, I remember when watching on Granada Plus, around the 1989-91 era there I noticed was one director (can't remember which, but looking at Corriepedia I have a feeling it was Brian Mills) who seemed to always replace the end shot of the opening titles.
Last edited by james-2001 on 12 February 2018 11:14pm - 2 times in total