Recommendation 21

The IPA stated that releasing all data at the detailed level would cause issues within the supply chain. It argued that it does not release its own assurance reviews so that it can have effective and candid discussions with programme leaders, which would be undermined if the reviews were made public.40 Nonetheless, it agreed that overarching data on programmes should be available and pointed to the GMPP performance data that is released quarterly and annually alongside the IPA’s annual report. The NIC also told us that government plans to publish business cases, outturn costs and schedules and other long-term evaluations of projects on the GMPP from April 2021, which we welcome.41 33 Q 49 34 C&AG’s Report, para 48 35 Q 37 36 Q 55 37 C&AG’s Report, para 46 38 Committee of Public Accounts, Whitehall preparations for EU Exit, HC 682, 2 December 2020, Conclusions and recommendations, para 6 39 Q 39 40 Qq 39, 45 41 National Infrastructure Commission submission, page 2 Lessons from major projects and programmes 13 However, GMPP data is a snapshot at a point in time and we have reported in the past how the publication of this data months in arrears means there is a lag between the reported data and what is actually happening on a project.42 The Infrastructure and Projects Authority’s Assurance