Did a film 's British executive producer executive produce M0 and write a film
SELECT count(*) WHERE {
?x0 ns:film.producer.films_executive_produced ?x1 .
?x0 ns:film.producer.films_executive_produced M0 .
?x0 ns:film.writer.film ?x2 .
?x0 ns:people.person.nationality ns:m.07ssc .
?x1 a ns:film.film .
?x2 a ns:film.film
}