its possible to run just one example from the outline by using the line number, so if your UK example was on line 8 of simple.feature
you could run
cucumber features/simple.feature:8
There is no way to run a bunch of features and exclude a particular scenario without tagging or modifying the feature file as far as I'm aware. Run cucumber --help
to get full details. Personally I can't understand why you would want to do this, perhaps you could explain why you want to do this and give an example, there might be alternative workflows that would work for you.