Was M3 written by a British actor and edited by M2 's director and editor
SELECT count(*) WHERE {
?x0 a ns:film.actor .
?x0 ns:people.person.nationality ns:m.07ssc .
?x1 ns:film.director.film M2 .
?x1 ns:film.editor.film M2 .
M3 ns:film.film.edited_by ?x1 .
M3 ns:film.film.written_by ?x0
}