Chancellor George Osborne turned to the Bank of England on Wednesday to do more to help spur the country's stagnant economy as he announced a halving of this year's growth forecast.
In an annual Budget statement peppered with cat-calls from opposition politicians, Osborne said the central bank's inflation target would remain at 2 per cent a year - but that that was not enough.
"As we've seen over the last five years, low and stable inflation is a necessary but not sufficient condition for prosperity," he told parliament.
Osborne said the country's economy was now expected to grow only 0.6 per cent this year, half the rate predicted only three months ago, but he vowed to stick the course on austerity.
"It is taking longer than anyone hoped, but we must hold to the right track," he said.
Osborne said he was publishing a review of the Bank of England's mandate and said the central bank might need to use "unconventional monetary policy instruments" and give a clearer idea of what it will do in the future.
Such instruments in the past have included printing money to buy assets as a way of pumping cash into the moribund economy.
"The new remit explicitly tasks the MPC (Monetary Policy Committee) with setting out clearly the tradeoffs it has made in deciding how long it will be before inflation returns to target," he told parliament.
Such a change might make the Bank operate in a way similar to the US Federal Reserve which has given increasingly explicit signs about how long it will continue to provide support to the US economy.
Sterling briefly fell against the dollar and was weaker against the euro. British bond, or gilt, futures pared losses.
The Bank moves coincide with the arrival in July of a new governor of the Bank, Mark Carney, currently the head of the Bank of Canada. Carney has previously said he wanted a debate on the role of the Bank.
Osborne said Carney and the central bank's current governor Mervyn King both agreed with the new remit which is set by the Chancellor each year. A further review of the mandate would be carried out before the end of 2019.
