It's not actually Thames Water's fault. Any physicist will tell you that it's the weather! If you had walked around London you would have seen quite a few burst pipes and water streaming out overground, coming from underground....There was even a main burst in Herne Hill I heard....don't quote me on that though.... Anyway what happens, is that we had 7 days of weather where the temperature was nearly constantly around freezing, so the water in some pipes froze , and then when it melted it expanded , thus some pipes burst etc....I'm guessing the low pressure/no pressure might be because of this.... If anybody wants to check if the area in which they live is effect by this, feel free to check out Thames Water's website here