Westminster's Abbey's medieval mosaic restored

Centuries of dirt and grime are being removed from a Medieval mosaic as two years of restoration work begins at Westminster Abbey in central London.
Henry III commissioned the Cosmati Pavement, an intricate multi-coloured marble, stone and glass floor, as a 13th Century centrepiece for the abbey.
Conservationists are also restoring damaged parts of the mosaic, measuring seven-and-a-half square metres.
It is hoped the restored mosaic will go on permanent public display.