The former chief of Ofwat, the water company watch-dog, blames Thames Water for 'neglecting their sewer system.'
Sir Ian Byatt went on to say:
"There is a lot of infiltration of water into their sewers, which is exacerbating the problem, and I think they should have done more to deal with that.
"My concern for the 'super-sewer' is that it's much too expensive. The job could be done very much more cheaply, engineering studies have shown you could do it for half the cost."