Well I am a bit surprised, was it just continuity, as they must have just aired the entire return night schedule from London?
It wasn't really proper continuity on Yorkshire, they did an announcement at 5.40 before handing over to the networked service from Thames. Presumably that was the case in other regions. But Tony Currie has said here that STV did their own continuity that evening, and even an in-vision closedown, although it looked crap because the camera hadn't been properly lined-up for twelve weeks.
It does say somewhere on Wikipedia that Westward came back two days before everyone else and did Westward Diary on Monday and Tuesday (and presumably no other programmes). I find that a bit hard to believe and I've not found any proof of that anywhere.