[Kunst]

And I'd be amazed if ITV3+1 didn't go 24/7 on Freeview once CITV closed.  There is obviously still considered to be value in them considering they're not being sacrificed in this era when everybody supposedly catches up on demand (and bringing the "restart" function to non-BBC Freeview channels doesn't seem to have got anywhere despite being touted a year or two ago).  Sadly though BARB don't report the +1 channels separately anymore, lumping them in with the main channel. 

One other thing I wonders is with CITV being a limited hours channel, unlike their commercial rivals, has that limited their advertising too.  Assuming the permitted level is the same as other channels I assume they can only air an average of 9 minutes of ads between 6am and 9pm, but the 24/7 channels can balance that average out by scrapping ads overnight and airing 12 minutes an hour between 6am and midnight.

Never thought about it, but I guess they rarely show adverts at the likes of 6am.

It's a bit more complicated than that, it's an average of 9 minutes of advertising per hour and maximum of 12 minutes max per hour, but they can still add a 3 minutes on average of teleshopping spots, which is for instance why Sky Comedy and More4 have at minor time slots an entire hour dedicated to back-to-back 12 minutes of that.

OT: the EU has went as far as removing the 12 minutes per hour max law, and just having an average of 12 minutes per hour between 6:00 and 18:00, and 18:00-00:00 (no limit on other time slots), which results in longer and/or more frequent ad breaks at peak times.
You can easily tell this is being applied in Italy, Netherlands, Sweden, Spain and beyond, now