My Grandmother used to say “It’s better than a kick in the teeth” when deflecting disappointment in an outcome–putting a positive spin on a negative. Being from the UK it seemed universal, but moving to Canada and saying that, people gave me odd looks.
The other one is when somebody is talking nonsense or a bit crazy, they would say “They are out of their tree”. For the Welsh the tree symbolizes stability and mental wellness (druids I guess) and if you were stressed or needed to chill their phrase translates to “I need to go back to my trees”