Did a British actor that was employed by M3 edit M1 and M2
SELECT count(*) WHERE {
?x0 a ns:film.actor .
?x0 ns:film.editor.film M1 .
?x0 ns:film.editor.film M2 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M3 .
?x0 ns:people.person.nationality ns:m.07ssc
}