National Savings and Investments (NS&I), the U.K. government’s retail savings institution, has backed a simpler systems overhaul after delays, with delivery still contingent on funding and approvals.
Sir Jim Harra, NS&I’s accounting officer and interim chief executive, concluded in an assessment dated July 31, 2026, that the revised proposal met the U.K. Treasury’s tests for regularity, propriety, value for money and feasibility, provided the necessary funding and approvals are secured. Ministers approved the revised business case Oct. 5. GOV.UK added the 2026 assessment to its transparency page Wednesday, Nov. 4.
The program began in 2020, aiming to replace NS&I’s single outsourced provider with multiple suppliers while updating aging systems. NS&I raises financing for the government through retail savings and investment products.
Harra traced delays and rising costs to planning assumptions that missed the difficulty of replacing connected legacy technology and data systems while coordinating suppliers. He also pointed to commercial and technical dependencies and the time and expense the program would require.
The proposed “Simplified Solution” would reduce technical integration and vendor-management demands compared with the earlier design. Harra favored it over other options, including a minimum-investment approach focused on maintaining current operations.
The assessment says the program aims to strengthen resilience and make NS&I a more cost-effective, scalable and agile source of government finance. It warns that extended support for several key technology components is expected to end within two to three years. Harra said failing to replace NS&I’s core banking capability would increase risks to operations, resilience and service.
The preferred option exceeds the allocation in the 2025 Spending Review, with HM Treasury considering affordability, the assessment says. The assessment gives no date for a further decision; the program remains subject to securing the required funding and approvals.
