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Thames Tideway Tunnel

House of Lords written question – answered on 25th February 2013.

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Photo of Lord Berkeley Lord Berkeley Labour

To ask Her Majesty's Government what were the dates of (1) the data used, and (2) the conclusions, of the cost-benefit calculations on which the decision to build the Thames Tideway Tunnel was made.

Photo of Lord de Mauley Lord de Mauley The Parliamentary Under-Secretary of State for Environment, Food and Rural Affairs

Defra published a regulatory impact assessment on sewage collection and treatment for London in March 2007 and a Costs and Benefits of the Thames Tunnel document in November 2011 (as an annexe to a strategic and economic case for the Thames Tideway Tunnel). Both documents listed the sources of their data. Defra also published in February 2012 a list of the evidence associated with the case for the tunnel (with the relevant dates of publication), entitled the Thames Tunnel Evidence Assessment.

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