Were M2 and M6 executive produced by M3 , M4 , and M5 and written by a British cinematographer
SELECT count(*) WHERE {
?x0 a ns:film.cinematographer .
?x0 ns:people.person.nationality ns:m.07ssc .
M2 ns:film.film.executive_produced_by M3 .
M2 ns:film.film.executive_produced_by M4 .
M2 ns:film.film.executive_produced_by M5 .
M2 ns:film.film.written_by ?x0 .
M6 ns:film.film.executive_produced_by M3 .
M6 ns:film.film.executive_produced_by M4 .
M6 ns:film.film.executive_produced_by M5 .
M6 ns:film.film.written_by ?x0
}