“For UK trails” is completely meaningless.
I’ll say the current model Formula The Ones, partly because they’re one of the first class brakes, but mostly because they’ll never be the wrong brake no matter what you want to do with them. They’re lighter than most XC race bikes and have great feel, but are more than powerful and durable enough for downhill. Just vary rotors to suit.
And the lever feel’s not too divisive either, unlike say Magura or Shimano (and it’s very tunable, if you get the FCS). Very reliable, and parts are easily available from CRC
They’re not good value though- tbh no brake this expensive could be.