Wouldn't that be two different sets of transmission controllers? TVX was owned by Richard Desmond's Northern and Shell until a couple of years ago.
It probably was once the channels became seperate in the digital era, but in the analogue days it was one TX suite doing the whole 24 hours. They just played the end of UK Living, put up a caption saying 'The Fantasy Channel is next' and then played TVXs first programme
How did stuff like that work? Living was owned and operated by Flextech and wasn’t, in a similar way that Playboy TV used to appear after Sky Sports 3 ended, even though Playboy was not owned or ran by Sky. For that matter Nick Jr was shown on Sky Sports 3 downtime for a while too.
In the case of TVX, Thames/Pearson part owned (along with the BBC) UK Living so did its playout... and TVX just contracted them to do their channel too. They'd s just end their schedules and programme tapes to them