ITV Hub

[no1fanofthepals]

How come ITV Hub adverts are played on Channel 4?

Because ITV paid for airtime on Channel 4.

Happens fairly frequently, even for specific programmes. I believe you just can’t mention an actual time/date on another channel.

I assume that rule doesn't apply to streaming services, though they're less likely to be promoting the linear airing anyhow.

UKTV Play is advertised all the time on All4 too.  In a way I guess promoting the rival ad supported services promotes them as a whole.

I do remember one time on All 4 where the trailer for an ITV drama was promoted as being on ITV and ITV Hub. Just no times.