Great Britain & Northern Ireland are choices, but they don't work
If you want the UK teams they are on page 2 of a 250 team listing by location just before USA teams in the alphabet.
1797 ----- London, ENG United Kingdom ----- Bloomberg LP / Providence Equity Partners L.L.C / GMT Communications Partners / Clarion Event Ltd / Bechtel & The American School in London
1884 ----- London, ENG United Kingdom ----- Bloomberg LP / Providence Equity Partners L.L.C. / GMT Communications Partners / Bechtel & The American School in London
5781 ----- London, ENG United Kingdom ----- Bloomberg & The Petchey Academy