I mean, these are not UK specific, but if you want a break from the constant negativity, here are some sites that report specifically on positive news:

• https://www.goodgoodgood.co/
• https://www.goodnewsnetwork.org/
• https://fixthenews.com/
• https://positivenewsfoundation.org/
• https://www.onlygoodnewsdaily.com/

And here's 35 more: https://news.feedspot.com/good_news_websites/

Some communities on Lemmy you might be interested in:

• !lemmybewholesome@lemmy.world
• !goodnewseveryone@sh.itjust.works
• !upliftingnews@lemmy.world
• https://lemmy.world/c/hopeposting
• https://lemmy.world/c/worldinprogress
• https://lemmy.world/c/climatehope