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The UK鈥檚 top infrastructure advisor has labelled HS2 as 鈥渦nachievable鈥� in its latest assessment of the government major projects portfolio (GMPP). 

In its annual report on the GMPP, the Infrastructure and Projects Authority (IPA) gave 鈥渞ed鈥� ratings to both Phase 1 and Phase 2a of the high-speed rail project. 

Major projects subject to delivery confidence assessments by the IPA are given green, amber or red ratings each year, with the latter applied to projects that the body thinks need to be re-scoped or reassessed entirely. 

This could be due to major issues with project definition, schedule, budget, quality or the benefits of delivery which 鈥渄o not appear to be manageable or resolvable鈥�. 

Earlier this year, spiralling costs led leading transport secretary Mark Harper to announce a major re-phasing of the project, including mothballing the Euston site. 

This month, the Public Accounts Committee said the decision to freeze work at Euston showed the government 鈥渄oes not know what it is trying to achieve with the station鈥�. 

The GMPP is divided into four categories 鈥� military capability, information and communication technology, transformation and service delivery and infrastructure and construction (I&C) 鈥� with the HS2 included in the latter. 

IPA chief executive Nick Smallwood said the I&C jobs it oversees had been more severely impacted by recent economic pressures, including stubbornly high inflation and rising interest rates. 

鈥淲hen cost is considered, I&C represents 70% of the GMPP鈥檚 Red Delivery Confidence Assessment,鈥� he said.  

鈥淭his area has been most impacted by the covid-19 pandemic and the war in Ukraine, which have caused high inflation, reduced affordability and bruised market confidence.鈥� 

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The portfolio of projects overseen by the IPA 鈥� the government鈥檚 centre of expertise for infrastructure and major projects which reports to the Cabinet Office and Treasury 鈥� increased from 235 to 244 this year, despite warnings from Smallwood that the GMPP was overprogrammed. 

At a House of Lords committee hearing in January, Smallwood said the UK was 鈥渢rying to do too much鈥� and that the IPA was only able to provide active support to less than half of the government major projects portfolio. 

There are 76 I&C projects in the GMPP, which together have a total whole-life cost of 拢403bn.  

Eight of these schemes are rated red by the IPA and six are rated green. The vast majority (59) have been given amber ratings, including Northern Powerhouse Rail, small modular reactor development, public sector decarbonisation scheme and the socila housing decarbonisation fund. 

The levelling up department鈥檚 18+m building remediation programme received an amber rating having previously been rated green, while the Department for Education鈥檚 T-Level programme dropped from amber to red.