question: Was M2 written by M3 and M4 and directed by a British editor of M1
query: 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
  }