Ever the gourmand, Richard Rogers talks briefly about his lunch, before handing over to softly spoken partner Graham Stirk, who proceeds to deliver a measured sermon on their proposal in the manner of a primary school teacher giving an assembly to year three. "We're quite interested in the term 'legibility'," he says hesitantly, before reassuring the board that "we're desperate to try and make it feel like one building that isn't sat on a funny suitcase".

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