A new film by DON HAWORTH The Story of a City's Water Each of us now uses 35 gallons of water a day and it costs next to nothing - about ½p apiece. So it's a shock in this free-swigging and sodden island to learn that some reservoirs are already down to the dregs and the whole country is in for a thirsty spell unless something drastic is done soon. The government is bracing itself to act. Tonight's film takes the water story so far, from the raindrop through a great industrial city to the sea, from the Victorians' first brash floodings of country valleys to the politics of meekness and the technology of electronic gadgets. Commentary read by DAVID MAHLOWE