By David Milliken and William Schomberg
LONDON (Reuters) -Britain will have to be nimbler in the way it manages the public finances if interest rates go up, because government bonds carry shorter maturities than in the past and are increasingly linked to inflation, the head of the country's budget watchdog said.
Richard Hughes, chairman of the Office for Budget Responsibility, said the government would have less time than in the past before its borrowing costs go up once growth and inflation return.
Even in the most benign scenario, strong economic growth would not significantly lower the stock of Britain's public debt - which has soared above 2 trillion pounds ($2.7 trillion) as a result of the COVID-19 crisis - he told lawmakers.
"The government's ability to get breathing space from faster growth before interest rates catch up, or indeed (from) higher inflation before interest rates catch up, is just a lot less than it's been in the past," Hughes said.
Official data published earlier on Wednesday showed the government's debt-servicing costs rose to a record 8.7 billion pounds in June, pushed up by rising inflation.
Hughes told the British parliament's Treasury Committee that there needed to be clear and open communication between the Bank of England and the government about the likely path for interest rates.
He also said the government needed to preserve room for manoeuvre in its budget to respond to future shocks which were becoming more frequent, more expensive and less predictable.
"So (by) just building up capacity in one area like the health service, you will be well-equipped to deal with the next pandemic. But what if the next shock is a cyber attack? What if the next shock is our out-of-control climate change?" he said.
British finance minister Rishi Sunak has said he will get Britain's publish finances back on a sustainable path so the government has the capacity to respond to future shocks.
Britain's budget deficit rocketed to 14.2% of gross domestic product during the financial year to the end of March 2021, its highest share of GDP since World War Two, thanks to a surge in public spending and tax cuts ordered by Sunak to offset the coronavirus hit to the economy.
($1 = 0.7312 pounds)