Was M2 a person that a British producer of M1 was influenced by and influenced
SELECT count(*) WHERE {
?x0 ns:film.producer.film|ns:film.production_company.films M1 .
?x0 ns:people.person.nationality ns:m.07ssc .
M2 a ns:people.person .
M2 ns:influence.influence_node.influenced ?x0 .
M2 ns:influence.influence_node.influenced_by ?x0
}