Recommendation 22

HS2 Ltd explained that it had not expected to have an estimate of costs that it was confident in until the end of 2022 following work by the construction partner on a detailed, ‘bottom-up’ costing of the design.55 This followed the two-stage procurement process that HS2 Ltd told us it is employing on the HS2 programme, where the construction partner is first appointed based on capability and suitability and then works with HS2 Ltd to develop a design and agree a target price for construction.56 The Department confirmed that this is a standard approach for large construction projects where there is significant unknown risk and where more design work is required before a realistic target price can be agreed.57 45 Written statement to Parliament, HS2 6 monthly report to Parliament: October 2020, 13 October 2020 46 Committee of Public Accounts, High Speed 2: 2022 Spring Update, 16 May 2022, Q 48; Written statement to Parliament, HS2 6 monthly report to Parliament: October 2022, 27 October 2022 47 Committee of Public Accounts, High Speed 2: 2022 Spring Update, 16 May 2022, Q 48; Written statement to Parliament, HS2 6 monthly report to Parliament: October 2021, 20 October 2021 48 Committee of Public Accounts, High Speed 2: 2022 Spring Update, 16 May 2022, Q 48; Written statement to Parliament, HS2 6 monthly report to Parliament: March 2022, 16 March 2022; Written statement to Parliament, HS2 6 monthly report to Parliament: October 2022, 27 October 2022 49 C&AG’s Report, para 2.19 and Figure 7 50 Q 5 51 Ibid 52 Ibid 53 Ibid 54 Q 8, C&AG’s Report, Figure 7 55 Qq 6, 8 56 Q 10 57 Q 11 HS2 Euston 15