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: