[Stooky Bill]

Must also be remembered LWT (and probably Thames for that matter) lost a chunk of coverage from was it Bluebell? and it was given to TVS, although I'm not sure if that's the main reason why the LWT startt time was changed.

It was apparently because LWT complained that Thames used to schedule stuff that gave them a poor audience for 7pm. Starting at 5:15 allowed them to start the evening how they wanted. And so instead of the dull stuff Thames put out at 6pm they had The Six o Clock show which was a big hit and set the tone for the weekend.

6oCS was the actual start of the weekend for those of us in London at the time