question: Were M3 and M4 written by a film 's editor and written by a British actor of M1
query: SELECT count(*) WHERE {
  ?x0 ns:film.actor.film/ns:film.performance.character M1 .
  ?x0 ns:people.person.nationality ns:m.07ssc .
  ?x1 ns:film.editor.film ?x2 .
  ?x2 a ns:film.film .
  M3 ns:film.film.written_by ?x0 .
  M3 ns:film.film.written_by ?x1 .
  M4 ns:film.film.written_by ?x0 .
  M4 ns:film.film.written_by ?x1
  }