[newsjunkie]

I think it’s being announced tomorrow where Gareth Barlow is moving to. He mentioned in an Instagram story a press release is scheduled. He’s also said he gets weekends off. I guess Sky is most likely. Could well imagine him getting something high profile.

While Sky is possible, I'm not sure where there are gaps in the midweek schedule - unless it is on the rundown.
Another option is CNN. I know they have been trimming rather than adding shows recently, but he definitely has the CNN look they seem to like in the British presenters.
There are of course plenty of other channels with London studios as well as several radio stations.