To ask the Secretary of State for Transport, what estimate he has made of the cost of the signalling component of the Great Western Modernisation Programme at the most recent date for which figures are available.

At present Network Rail’s Chair, Sir Peter Hendy, is reviewing the enhancements programme, including upgrades on the Great Western line. Due to interdependencies, renewals of signalling must be looked at in parallel with this, as part of Network Rail’s work to update its Delivery Plan. Therefore it is not possible to provide an up to date cost estimate until the conclusions of these reviews and plans are known.