Was M1 a British male film producer that wrote a sequel of M0
SELECT count(*) WHERE {
?x0 ns:film.film.prequel M0 .
M1 a ns:film.producer .
M1 ns:film.writer.film ?x0 .
M1 ns:people.person.gender ns:m.05zppz .
M1 ns:people.person.nationality ns:m.07ssc
}