Hi there.
From what I know of, arrangers aren't too popular in the UK, and one-man keyboard musicians are rare. It seems that people generally prefer people in bands. If you want live-music, you hire a band not an entertainer - that's generally how it goes here.

In all honesty, I've never been able to understand styles (I'm famous in this forum for this opinion!) despite listening to a lot of sound samples of many people in this forum performing. I never actually realised professional musicians used 'accompaniments' until I came into this forum. I'm not going to go into any more detail or I'll be public enemy number one again. However to answer your question, I'll just say arrangers are not popular in the UK