I don't know how these things are worked out, but there are seven books on the Compton Crook shortlist. Four of these are by US authors. Three are by European authors - all UK by residence.
I've read - and really enjoyed - Emmi Itäranta's Memory of Water, so I decided to pick up Laline Paull's The Bees as being the other UK entrant.
I'm only a few pages in, but the underlying premise is fascinating - viewing the life of bees from the PoV of a lowest-caste worker, Flora 717. I'm already conscious that there's a subtext of ecological collapse, which is certainly timely. And lots of scope for exploring the pressures of living in a sharply stratified society.