I've seen a few posts asking about this and this article just popped up on my Facebook - Michael Gove has said children under the age of 18 can travel between both parent's home. Sounds like the government will be clarifying a few other things today as well (if today is Tuesday? I don't know anymore...).
https://www.walesonline.co.uk/news/uk-news/what-happens-children-separated-divorced-17969153?utmsource=facebook.com&utmmmedium=social&utmcampaign=walessmain