<P> The series was green - lit in July 2016 , following extensive research by Kosminsky . Most of the location filming was undertaken in Spain later that autumn . </P>
<P> The series was green - lit in July 2016 , following extensive research by Kosminsky . Most of the location filming was undertaken in Spain later that autumn . </P>
where did they film the state channel 4
where did they film the state channel 4
Spain
Spain