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I’d be very surprised if it was an evening launch, I’ve never known a tv channel to rebrand in the middle of the day or on an evening personally…

BBC One - 7pm in 1985
Channel 4 - 8pm in 2017
Channel 4 - 9pm in 2015

There may well be others.

There’s quite a few - Five did it with most of their rebrands during that era iirc, with actual showcases of the new look. It would be just before big US imports like Prison Break started on the channel. It makes sense as a method - wait until there’s a lot of eyes on the screen at prime time to be like “by the way, this is what we look like now.” etc. I don’t know if there’s anything on ITV tonight that would warrant that though.