Morning fog envelopes pedestrians crossing the river Thames on the Millennium Bridge with the dome of St Paul's Cathedral in the background. A mother and child with another person make their way across the bridge, muted colours from the green screen making a subdued landscape. It is mid-morning but the misty conditions have still to improve enough for visibility to allow a clear view a cross the river where city offices and skyscrapers are normally seen. London's Millennium Footbridge is a steel suspension bridge for pedestrians linking Bankside with the City of London. The Wren-designed St Paul's is built of Portland stone in a late Renaissance style that represents England's sober Baroque.