On a blustery Monday last November, the day after Armistice Day, French Armed Forces Minister Sébastien Lecornu and DGSE chief Nicolas Lerner together officially launched the building works on French foreign intelligence's future headquarters, before stepping away from the assembled officials for a tête-à-tête, as the attendant French tricolour whipped about in the wind.

From this parade ground at the Fort Neuf de Vincennes, just