This is analysis, not investment advice.
Britain is reviving a financing idea last used in the World Wars. A proposal for "defence bonds" — government securities marketed directly to the public and dedicated to military spending — is drawing support as the country debates how to pay for a bigger armed forces, Investing.com reported. Backers estimate such bonds could raise at least £10 billion in the first year and potentially more than £20 billion over two years, with the proceeds ring-fenced for defense.
How a government bond works
To see what's new here, start with how the UK normally borrows. The government sells gilts — UK government bonds — to investors. A gilt is essentially an IOU: you lend the government money for a fixed term, receive regular interest (the "coupon"), and get your principal back at maturity. The Debt Management Office, an arm of the Treasury, issues them, mostly to banks, pension funds and other big institutions.
A "war bond" or defence bond would use the same machinery, with two twists: it would be aimed at ordinary savers, and its proceeds would be legally tied to defense, giving buyers a sense of investing in a national cause rather than just lending to the state.
Who's proposing it
The idea has gathered cross-party interest. Liberal Democrat leader Ed Davey has called for defence bonds to fund up to a £20 billion boost to military spending and reduce reliance on the United States. A Defence Bonds (Proposals) Bill has been introduced in Parliament, and Lord Hain, a Labour peer and former cabinet minister, has promoted the concept to the Chancellor and Prime Minister. Chancellor Rachel Reeves has been reported to be considering war bonds as one option, alongside support from some MPs and senior figures in the City of London.
Why now
The push reflects a hard fiscal squeeze. Britain has committed to raising defense spending and has already earmarked an extra £13.5 billion, per Investing.com, with the government aiming for 2.5% of GDP by 2027 and NATO allies signed up to a longer-run goal of 3.5% on core defense by 2035. But UK public debt sits around 100% of GDP, leaving the Treasury little room to borrow freely through normal channels. A dedicated bond aimed at patriotic savers is, in part, a search for funding that doesn't simply add to the conventional gilt pile that markets scrutinize.
The catch
Critics make a basic point: a defence bond is still borrowing. Unless the public buys it at below-market interest rates — accepting a lower return for patriotic reasons — it raises no cheaper money than an ordinary gilt; it just relabels the debt. Whether savers would actually accept a worse deal is unproven. As the Spectator argued, war bonds "won't fix chronic underinvestment" and risk masking the deeper choice — whether to fund defense properly through the regular budget.
The history cuts both ways. Britain successfully sold war bonds and savings certificates to citizens in both World Wars, tapping genuine national urgency. The open question is whether a peacetime rearmament drive can summon the same public appetite — and whether, in a £1 trillion-plus gilt market where foreign investors already hold roughly a third of UK debt, a retail defence bond would be a meaningful new source of money or mostly a symbol. For now it remains a proposal, not policy: any decision would need government approval, and none has been announced.
