To ask the Deputy Prime Minister pursuant to the oral contribution of the Secretary of State for Defence of 2 September 2013, Official Report, column 5, on the Trident Alternatives Review and the written answer of the Chief Secretary to the Treasury of 2 July 2013, Official Report, column 6W, on Trident, if he will provide details of the cost of the Trident Alternatives Review to the public purse in terms of (a) cost and (b) officials' time.