Keeley, Jen, Owain, Kay and Abbie are journalists who have had some training in how to take the forecast somebody else has prepared and interpret it to be able to tell the story on air.
That means they can multi task and work on other non-weather stuff, whereas Paul is very much a weather specialist, and actually able to prepare the forecast himself. (I suspect that these days it's more a case of tweaking the provided forecast with a bit of local knowledge.)
Tonight we experienced some technical difficulties with our programme, which saw coverage from the Tyne Tees region air instead of our own. We are currently looking into this issue and apologise for any inconvenience. 🎥— ITV News Border (@ITVborder) May 18, 2020
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Presumably no one dedicated to that, just a monitor showing the output to the gallery team who would be concentrating on the live TTTV programme?
Depends when they realised and depends on which region was going out live.