There are more American and Japanese composers because they have better music education.
With music being next to non-existent in English schools there are less chances of people developing an interest.
America and Japan seem to be more open to modern ideas, where as Classical music in England is rife with snobbery. This fascism stops young composers from being discovered and celebrated.
Full list of composers (including ones not in the video):
Bob and Barn
Harry Gregson Williams
Rupert Gregson Williams
Gerald V. Casale
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