It has been a massive undertaking. An entire wing of the Victoria and Albert Museum has been requisitioned. A suite of ten galleries has been completely overhauled. More than £30 million has been spent. But now, at last, the new Medieval and Renaissance Galleries, with 2,000 objects that stretch from AD300 to 1600, open this week. This is a wonderful display that transforms the V&A from an outmoded Victorian maze of glass cases into a modern museum of world-class calibre.