The Stirling is the UK’s top prize for architecture. “The official line says that the Stirling goes to the British-designed building ‘which has been the most significant for the evolution of architecture in the past year’, a sentence packed with assumptions. Does it go to the prettiest? The most thrilling? To the architect most deserving? Or, old-fashioned notion this, to the building that best fulfils its brief, be it a bicycle shed or a cathedral?”