[holding answer 6 March 2007]: Responsibility for London Underground passed to Transport for London and ultimately the Mayor on 15 July 2003. Performance and operation of the PPP Contracts is a matter for London Underground (LU). Delivery of the sub-surface line upgrades rests with LU’s PPP contractors and they will determine the amounts to be spent on the different elements of the upgrade in order to meet the outcomes described in the PPP contracts. As I stated in my letter of 8 February, about £266 million is being invested in new rolling stock (trains) and £433 million will be invested in new signalling, between 2005 and 2010, significant further investment will occur after 2010. It is not possible to disaggregate other investments such as the on-going station refurbishment programme or track replacement costs from the payments made by London Underground to its PPP contractors.