a friend of mine has just had to pay a water bill of in excess of 500gb pounds for 3 months, what happened was that when he went back to the uk he turned of his watermains on the outside of his appertment as usual, however didnt bother with internal valves, a neighbour or someone turned on the valve by mistake we presume and a valve in his wc blew causing it to continually flush, money down the drain!! be warned.!!