What has changed?

1 second 2 seconds 3 seconds 4 seconds 5 seconds 6 seconds 7 seconds 8 seconds 9 seconds 10 seconds 11 seconds 12 seconds 13 seconds 14 seconds 15 seconds 20 seconds delay, loading photo...          Looking towards the Greyhound pub, adjacent to the church at Chalfont St Peter, in 2004  Author: Quiller Barrett,          No water flow in 1997  Author: Chiltern Society,