Question to the Department for Transport:

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.

The 2013 cost estimate for the electrification of the 121 miles of the Great Western Main Line between Heathrow Airport Junction and Cardiff was £1.7 billion. The work was completed in 2020 at a cost of £2.8 billion. The scope of the Great Western Electrification Programme was reduced in 2015 with the removal of the 45 miles between Cardiff and Swansea, the 30 miles between Chippenham and Bristol Temple Meads via Bath, and the five miles between Bristol Parkway and Bristol Temple Meads.