The Kingsman - so it is an "internional" intelligence agency rather than a British one but we know what inspired the look of the older spies... as if the modern Daniel Craig Bond wasn't enough to remind us that the glory of Great Britain has passed.
According to the Capella Romana FB page: "Mr. Angelopoulos was the teacher of Dr. Alexander Lingas, and in many respects was the inspiration for the founding of Cappella Romana. John Michael Boyer was also his student. Both Dr. Lingas and Mr. Boyer will attend his funeral on Wednesday. His Greek Byzantine Choir was presented in the Pacific Northwest by Cappella Romana in 2005."