UK borrowing costs rise amid ongoing uncertainty about Prime Minister’s future
UK borrowing costs have increased as uncertainty surrounds the future of Prime Minister Sir Keir Starmer. Investors have been unsettled by the possibility of a leadership change, which has contributed to a rise in government bond yields. This development comes amid broader concerns about inflation and interest rate hikes driven by rising oil prices linked to the conflict in Iran.
Impact of leadership uncertainty on UK borrowing costs
On Tuesday, the effective interest rate on UK government borrowing over 10 years briefly reached 5.13%, levels not seen since the 2008 global financial crisis. This jump reflects investor anxiety about the potential fiscal policies of a new administration. The risk that successors to Sir Keir Starmer might loosen public spending and increase government borrowing has heightened market concerns.
Financial markets have reacted to these developments with notable volatility. The FTSE 100 index fell more than 1% at the start of trading but later recovered to close down just 0.04%. Shares in major banks such as Lloyds, NatWest, and Barclays declined amid fears of a possible tax increase under a new government. Additionally, the pound weakened by 0.5% against the US dollar, falling to $1.35.
Broader economic context and investor concerns
The rise in UK borrowing costs is part of a global trend driven by inflationary pressures from higher energy prices following the Iran war. Oil prices have surged above $100 a barrel, pushing up inflation expectations and prompting fears of further interest rate hikes worldwide.
However, the UK has experienced relatively higher borrowing costs compared to other countries with similar-sized economies. Analysts attribute this to the perceived risk of increased public spending if there is a change in Labour party leadership. While Prime Minister Starmer and Chancellor Rachel Reeves have pledged to maintain strict borrowing rules to reassure markets, some Labour MPs have questioned whether these rules are suitable for long-term economic renewal.
Capital Economics analysts noted that any change in leadership could lead to higher borrowing costs and a weaker pound. They identified potential challengers to Starmer—Andy Burnham, Angela Rayner, and Wes Streeting—as likely to increase public spending, which would concern investors.
Anna Macdonald, investment strategy director at Hargreaves Lansdown, explained that the bond market has been unsettled by the possibility that a new prime minister might relax or extend fiscal rules. This uncertainty leads investors, including a significant proportion of overseas buyers, to demand a higher risk premium on UK government bonds.
Understanding government borrowing and bond yields
Governments finance spending beyond their tax revenues by borrowing money through issuing bonds or gilts. Investors who buy these bonds expect to be repaid with interest. The interest rate, or yield, reflects the perceived risk of lending to the government. If investors see higher risk, they require higher yields to compensate.
On Tuesday, yields rose across UK government bonds with terms of two, five, 10, and 30 years. The yield on 30-year bonds reached 5.81%, the highest since 1998. The 10-year gilt is a key benchmark for government borrowing costs, while shorter-term gilts influence fixed-rate mortgage rates.
Compared to other European countries like France and Germany, the UK saw a slightly larger increase in borrowing costs. The surge in inflation expectations due to energy price rises has been the main global driver of these increases in recent weeks.
The cost of servicing the UK’s existing public debt is linked to inflation and bond interest rates. This cost has been rising and now accounts for about £1 in every £10 the government spends, highlighting the fiscal challenges facing the UK amid current economic uncertainties.
