Was M2 written by M3 and M4 and directed by a British editor of M1
SELECT count(*) WHERE {
?x0 ns:film.editor.film M1 .
?x0 ns:people.person.nationality ns:m.07ssc .
M2 ns:film.film.directed_by ?x0 .
M2 ns:film.film.written_by M3 .
M2 ns:film.film.written_by M4
}