I've just found a Connecting Wall type game with UK terms and spellings which is very good. Each day there is a puzzle that is either Easy, Medium, Hard or Extreme. I've found it quite useful that I can ask for a clue when I get stuck on one of the more difficult groups, but didn't need that today!
I still haven't got the hang of it though. I prefer the NYT version where you choose your 4 and then press "submit". This one assumes you are submitting even if you're still guessing.