Question to the HM Treasury:

To ask the Chancellor of the Exchequer, what steps she has taken with the Minister for the Cabinet Office to help tackle the increase in whole-life costs associated with levels of delivery confidence in the Government's Major Projects Portfolio.

The government recently created the National Infrastructure and Service Transformation Authority (NISTA) which will have an important role in supporting and monitoring major projects in the Government’s Major Projects Portfolio (GMPP).

NISTA provides expert advice and independent assurance on the GMPP and conducts regular deliverability assessments of major projects. Those assessments are published each year, most recently on 11 August 2025.

The increase in whole life cost of the GMPP portfolio reflects several new large high-cost projects joining and smaller projects successfully leaving the GMPP over the last year. By nature, GMPP projects and programmes are the longest, most complex and highest-cost projects, and therefore will inevitably experience challenges and hurdles. By being on the GMPP, these projects receive bespoke support, guidance and oversight which helps to set them on a path to success.