Were M3 and M4 written by a British film editor that executive produced and produced M1
SELECT count(*) WHERE {
?x0 a ns:film.editor .
?x0 ns:film.producer.films_executive_produced M1 .
?x0 ns:film.producer.film|ns:film.production_company.films M1 .
?x0 ns:people.person.nationality ns:m.07ssc .
M3 ns:film.film.written_by ?x0 .
M4 ns:film.film.written_by ?x0
}