question: Was M2 written and produced by a British editor and star of M1
query: SELECT count(*) WHERE {
  ?x0 ns:film.actor.film/ns:film.performance.film M1 .
  ?x0 ns:film.editor.film M1 .
  ?x0 ns:people.person.nationality ns:m.07ssc .
  M2 ns:film.film.produced_by|ns:film.film.production_companies ?x0 .
  M2 ns:film.film.written_by ?x0
  }