As a teenager I was fascinated by London’s architecture seen from Waterloo Bridge.  In 1955, a Guardian country diarist recorded his love of the exact same spot – but he saw swans, up to 50 of them in spring, summer and autumn. One night 20 swans flew under the bridge: “seen from above against the darkness of the water, the moving patterns of birds, all starkly white, gave me one of those moments of rare and striking beauty likely to remain in my memory forever.”