Further Extending the Framework to Social: The Next Evolution of UK Sovereign Sustainable Finance
When I first engaged with HM Treasury and the Debt Management Office in 2019 on the case for a UK Green Gilt, the objective was simple, the UK’s sovereign balance sheet should align with the country’s long-term strategic priorities. At the time, climate change was the most pressing challenge. The result was the UK’s Green Gilt programme, launched in 2021, which established the UK amongst the leaders in sovereign sustainable finance and demonstrated strong investor demand for financing linked to national climate objectives.
This resulted in an equivalent amount directed to Green projects to the over £74 billion of Green Gilts issued in three separate maturities. Five years later, the question is not whether Green Gilts have succeeded, the question is whether the framework should evolve.I believe it should, and not because the climate challenge has diminished, but because our understanding of sustainable investment has broadened as have the challenges to society.
A means to a Social End
A common misconception in sustainable finance is that environmental objectives are ends in themselves.Climate action should be as much about protecting people and prosperity; we reduce emissions to avoid economic and social harm. We invest in clean energy to improve affordability and security. We invest in resilience to protect communities from disruption. The ultimate goal is social welfare, economic prosperity and national resilience, environmental outcomes are one way of achieving it. In that sense, the Green Gilt programme was never just about carbon, it was about long-term national prosperity and resilience.
The Green Gilt Framework already recognises Social Benefits through the reporting of social co-benefits, this is not a departure from the principles behind Green Gilts.The Reporting associated with Green Gilts has highlighted outcomes such as:
● job creation,
● regional economic development,
● improved public health,
● reduced fuel poverty,
● greater energy security,
● enhanced economic resilience.
From the outset, the framework acknowledged that environmental investments often deliver wider social benefits. The next step is to extend that logic. If environmental investments can be recognised for their social impact, why should investments focused on social resilience be excluded from a sustainable financing framework?
Lessons from a Social Crisis – The Pandemic
I believe in the ability of financial markets, based in the City of London, to respond through financial innovation to any crisis and social crises are no exception. This can be evidenced by the huge uptick in issuance of social bonds in the aftermath of the pandemic. However, responses to the COVID-19 pandemic exposed vulnerabilities beyond environmental risks.
Across healthcare, justice, housing and local government, the UK now faces pressures that become more expensive when addressed too late. Too much public spending has been devoted to managing crises rather than preventing them.
Examples include:
● Court delays that result in extended periods on remand.
● Preventable health conditions that later require costly acute treatment.
● Mental health challenges that escalate before support is available.
● Housing insecurity that generates wider costs across public services.
● Youth disengagement that increases demands on welfare and justice systems.
These are not only social challenges, they are long-term fiscal challenges and require investment to reduce future liabilities.
An extension of the Framework should not fund general government expenditure.
Crucially Its focus should be disciplined and targeted.Eligible projects should demonstrate:
● measurable social outcomes,● long-term public benefit,
● evidence-based delivery,
● a credible pathway to reducing future fiscal costs.
The objective is not to spend more, it is to invest better.
Examples might include:
● reducing court backlogs and remand periods through modernisation and digitalisation;
● preventative healthcare programmes that reduce future demand on acute services;
● mental health interventions that improve workforce participation and reduce healthcare costs;
● programmes that reduce reoffending and improve rehabilitation outcomes;
● early intervention initiatives that reduce future welfare and criminal justice expenditure.
Like environmental investments, these projects require upfront spending to reduce future liabilities.
That makes them well suited to long-term financing through the bond market which is acknowledged as an appropriate instrument for funding infrastructure investment and social infrastructure is no different.
Governments have long borrowed to finance investments whose costs are incurred today but whose benefits accrue over generations. The financing of transport, all the way back to the railways of the Victorian era are an obvious example of debt financed infrastructure. They required substantial upfront capital, but delivered economic and social returns for decades, the same logic underpins modern infrastructure financing.
The challenge for policymakers is that not all infrastructure is physical. A modern economy depends not only on transport and energy systems but also on effective healthcare, efficient courts, skilled workforces and resilient communities.
Investment in reducing court delays, preventing ill health, supporting early intervention or reducing reoffending can generate measurable long-term benefits just as traditional infrastructure does but the asset being strengthened is social rather than physical.Extending the current Green Gilt framework should therefore focus on social infrastructure that requires investment today to improve outcomes and reduce future costs.
The International Market Has Already Moved Forward
The UK would not be entering uncharted territory. Several sovereign issuers have already broadened their sustainable debt frameworks:Luxembourg has issued sustainability bonds that combine environmental and social objectives.
The Czech Republic has established a sovereign social bond framework.Chile has built one of the world’s most comprehensive sovereign sustainable finance programmes, issuing green, social, sustainability and sustainability-linked bonds.These examples show that sovereign sustainable finance is evolving beyond purely environmental themes.
The UK has an opportunity to shape the next stage of that evolution, by extending the existing framework, not creating a new one.
The next stage in the evolution of the Green Gilt programme.The framework has already adapted. The Government’s decision to include nuclear energy recognised that sustainable finance must reflect changing policy priorities and technological realities. The underlying principle has remained consistent, aligning sovereign financing with the nation’s long-term interests.
I believe the question is whether that principle should now be applied more broadly. If nuclear energy can be included because it strengthens long-term resilience, there is a strong case for considering social investments that demonstrably improve resilience and reduce future public liabilities. This is not an argument for replacing Green Gilts or weakening environmental ambition, it is an argument for expanding a successful framework to reflect the wider challenges facing modern society.
A wider “Sustainability Gilt framework” could continue to accommodate Green investment but broaden financing to projects that generate measurable social outcomes and long-term fiscal savings andessentially move from Net Zero to a Just Transition in both funding and reporting. The transition to a sustainable economy is not only an environmental challenge, it is also a social one.
The next chapter of UK sovereign sustainable finance should build on the success of Green Gilts and encompass investments that strengthen social resilience, improve public outcomes and reduce future fiscal costs, but the principle remains the same as it did in 2019 in that the sovereign balance sheet should align with the nation’s long-term objectives. Today, those objectives are both environmental and social and our financing framework should reflect both.
Conclusion
Back in May 2019 my Green Gilt campaign was founded on a simple principle: sovereign financing should align with the nation’s long-term objectives.That principle has already proven adaptable. The inclusion of nuclear energy reflects a recognition that sustainable finance must evolve while remaining focused on long-term value creation.
The next logical step is to recognise that some social investments share the same characteristics as the environmental investments financed through Green Gilts: significant upfront costs, long-term benefits and measurable reductions in future liabilities.From nineteenth-century railways to the twenty-first-century energy transition, governments have used long-term debt to finance investments whose benefits are shared across generations, the challenge now is to apply that principle to social resilience.
A Sustainability Gilt framework would build on the success of Green Gilts, align sovereign financing with environmental and social priorities, and support the transition to a more resilient and inclusive economy. The opportunity now is to evolve and enable the next generation of UK sovereign sustainable finance.
Simon Bond
Board Member and Lead Expert, Impact Investing Institute
