This makes Foreign Office Architects the quintessential London architects. Its two principals, Farshid Moussavi and Alejandro Zaera-Polo, are from Iran and Spain, met at Harvard and made their name with a building in Japan. Their mildly confusing name (and this black-clad couple are emphatically not to be confused with the suited civil servants of the Foreign and Commonwealth Offices) refers to the global nature of their office. 'Usually, to be a foreigner means you don't understand very much,' they say, 'but there's also a naivety and a kind of freshness'.