Were M3 and M5 founded by M4 and founded by a British producer of M1 and M2
SELECT count(*) WHERE {
?x0 ns:film.producer.film|ns:film.production_company.films M1 .
?x0 ns:film.producer.film|ns:film.production_company.films M2 .
?x0 ns:people.person.nationality ns:m.07ssc .
M3 ns:organization.organization.founders ?x0 .
M3 ns:organization.organization.founders M4 .
M5 ns:organization.organization.founders ?x0 .
M5 ns:organization.organization.founders M4
}