What British actor that M4 starred did M1 and M2 employ
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:film.actor .
?x0 ns:film.actor.film/ns:film.performance.film M4 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M1 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M2 .
?x0 ns:people.person.nationality ns:m.07ssc
}