I recently revealed that the River Thames had won a prestigious international conservation award – the Thiess prize – as the world’s best cared-for river because of the way the quality of the water has been improved over the past fifty years or so.
We all take locks for granted as we travel up and down the Thames. These days, the modern electronic controls and smooth hydraulics that are in use at most locks allow easy passage from one river reach to another and the hardest problem for lock keepers to face is simply trying to fit a huge number of boats into the lock chamber.
