Was a British person M1 's editor , writer , and star
SELECT count(*) WHERE {
?x0 a ns:people.person .
?x0 ns:film.actor.film/ns:film.performance.film M1 .
?x0 ns:film.editor.film M1 .
?x0 ns:film.writer.film M1 .
?x0 ns:people.person.nationality ns:m.07ssc
}