Yesterday Ofwat published leakage data covering the year 2005/06. They state that leakage in England and Wales fell by 20 million litres per day during that period. "Most of the 22 companies met or performed better than the target set for 2005-06 by the water industry regulator." they said.
However, four companies failed miserably to meet their targets, with (surprise surprise) Thames Water and Severn Trent Water being singled out as the poorest performers. United Utilites and Southern Water also joined them in the high wasters category.