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."
Thames Water has today refuted claims by the former Ofwat chief that the company's plans for a 'super sewer' are overpriced.
Hammersmith and Fulham Council is a fierce critic of the Tideway Tunnel, saying the main construction site will blight the riverside.
The former boss of the water regulator Ofwat has criticised plans for a controversial new "super sewer" under London.