Meet outside the United Kingdom Supreme Court in Parliament Square and take a quick look at the Feilden and Mawson conversion (2006-9) of the Middlesex Guildhall (1912-13, by Gibson). Then cross Broad Sanctuary and the Close of Westminster Abbey to visit the magnificent Chapter House and the Great Cloister. The Chapter House is lavishly adorned with sculpture and wall paintings of the Apocalypse. It has one of the finest medieval tiled pavements in England and its architecture has remained unaltered since the mid 13th century. Lunch will be taken at St John's Smith Square, the costliest of Queen Anne's 50 new churches. Restored after the Blitz to be a concert hall. After lunch, move on to Westminster Cathedral (1895-1903), the Anglo-Byzantine masterpiece of J F Bentley. The marbles are splendid -over 100 varieties can be identified. The Chapel of St Andrew is a shrine of the Arts and Crafts movement. Eric Gill's Stations of the Cross (1914-18) are one of the finest works of religious art in England. There is a great deal of mosaic work, some still being installed. In short, it is a treasure house.