To ask the Secretary of State for Transport, what the initial cost estimate for the Great Western Rail Electrification Project was; and what was the (a) final cost and (b) total length of (i) rail electrified and (ii) rail left unelectrified (A) between Cardiff and Swansea, (B) on the Bath Spur and (C) on the Bristol Temple Meads Spur when removed from project scope.