In pictures: Tate Britain unveils £45 million gallery makeover Despite costing £45 million, the new building works at Tate Britain have resulted in little obvious change to the external appearance of our national gallery of British art and have delivered scarcely a single room of wholly new design inside it. Their focus has been the renovation of the earliest part of the Tate complex - the Thames-facing range built by architect Sidney Smith in 1893 - which might hardly suggest much opportunity for architectural innovation. And yet under the direction of the London-based practice, Caruso St John, the scheme that has emerged is something far bolder than a mere exercise in conservation.Picture: Paul Grover