The UK is enjoying growth to match the top economies in the world, Bank of England governor Mark Carney said as official figures looked set to show a third straight quarter of improved performance.
Mr Carney said the recovery was gaining traction but was coming from a low base and warned that it was heavily balanced towards household spending, with investment and exports lagging behind.
Figures from the Office for National Statistics are expected to show gross domestic product grew around 0.8% in the third quarter after 0.4% to 0.7% expansions in the previous three-month periods.
Mr Carney said: "What we are seeing is that the rate of growth in the UK is towards the top end of the advance economies but it is coming from a very, very low base.
"The balance of that growth is weighted more heavily towards the household sector at this stage.
"Investment is still relatively modest and the export side is challenged."
Mr Carney alluded to the fact that overall output remained below its peak just before the crisis five years ago.
He said: "We take some encouragement from what we are seeing but it is a long way back."
There has been speculation that the pace of the improvements in the economy and jobs growth may mean the Bank raising historically-low interest rates - which are tied to the jobless rate - sooner than expected.
But Mr Carney said: "The message to households is that the recovery has begun, is strengthening, but we are not going to withdraw monetary stimulus until it's really gained that traction."
The governor said that a recovery that was only in the south east of England was not sustainable and that it was now broadening geographically - though not across different sectors of the economy.
He made the remarks following a speech to mark the 125th anniversary of the Financial Times.