Were M2 and M3 directed by and produced by a British editor of M1 's prequel
SELECT count(*) WHERE {
?x0 ns:film.editor.film ?x1 .
?x0 ns:people.person.nationality ns:m.07ssc .
?x1 ns:film.film.sequel M1 .
M2 ns:film.film.directed_by ?x0 .
M2 ns:film.film.produced_by|ns:film.film.production_companies ?x0 .
M3 ns:film.film.directed_by ?x0 .
M3 ns:film.film.produced_by|ns:film.film.production_companies ?x0
}