Question 1

What does GMPP stand for?

Accepted Answer

GMPP stands for the Government Major Projects Portfolio, the UK government's list of its largest and riskiest projects, reported each year by NISTA, formerly the Infrastructure and Projects Authority.

Question 2

What is a delivery confidence assessment?

Accepted Answer

It is a rating of how likely a project is to deliver to time, cost and quality, on a fixed scale from Red to Green. The MPA assigned it first, then the IPA, and NISTA does now.

Question 3

How many GMPP projects are rated red?

Accepted Answer

The delivery-confidence mix chart on this page carries the count for every year, and the latest annual report's figures sit in the chart's own title.

Question 4

Where does the data come from?

Accepted Answer

From the annual GMPP data publications on gov.uk, one CSV per department per year, reused under the Open Government Licence.

Question 5

What share of UK GMPP projects cost more than their baseline?

Accepted Answer

60% of 279 projects now cost more than their baseline figure. UK Government Major Projects Portfolio (GMPP): the cost at the project's first snapshot against the cost at its latest; nominal, no CPI adjustment.

Question 6

What share of UK GMPP projects finish later than planned?

Accepted Answer

The source reports 49% of 328 projects finishing late. UK Government Major Projects Portfolio (GMPP): calendar months between the completion date at the project's first snapshot and the date at its latest.

Question 7

How many UK GMPP projects are rated Red?

Accepted Answer

20% of the 172 projects rated in 2026 Mar were Red. UK Government Major Projects Portfolio (GMPP): status as the source published it at each snapshot.

Question 8

How long before a UK GMPP project is first downgraded?

Accepted Answer

The 59 projects that were downgraded took a median 24 months to reach Amber/Red or worse. UK Government Major Projects Portfolio (GMPP): months between a project's first rated snapshot and the first one rating it Amber/Red or worse, over the projects rated in at least two snapshots.

Question 9

Do bigger UK GMPP projects overrun more often?

Accepted Answer

Cost sits above baseline for 52% to 67% of projects across the four size bands. UK Government Major Projects Portfolio (GMPP): share of projects above baseline cost, by quartile of project size. Association, not cause.

Question 10

How many UK GMPP projects enter and leave each snapshot?

Accepted Answer

78% of the 734 projects seen before 2026 Mar are absent from it. UK Government Major Projects Portfolio (GMPP): each bar holds the projects continuing from the previous snapshot and those entering at this one, so it is that snapshot's own population.