The UK economy grew by 0.4% in February from January as companies prepared for the lifting of a third coronavirus lockdown, according to official data which also showed a partial recovery in post-Brexit trade with the European Union.
Economists polled by Reuters had expected growth of 0.6%.
However, the data also showed that the fall in gross domestic product in January was not as severe as previously estimated, down by 2.2% compared with the initial reading of a 2.9% drop.
Britain's economy shrank by almost 10% last year, its biggest slump in more than three centuries and a more severe fall than in most European economies, as the country was battered by the coronavirus pandemic.
Today's data showed GDP remained 7.8% below its level a year earlier, shortly before the pandemic swept Europe, and was 3.1% lower than its level in October, before the two latest lockdowns hammered Britain's huge services sector.
But a fast rollout of Covid-19 vaccines has raised the prospect of a bounce-back this year and in 2022.
Non-essential shops and outdoor hospitality venues reopened yesterda.
British Prime Minister Boris Johnson hopes to relax most coronavirus restrictions before the end of June.
"While the UK is still on course for a modest contraction in GDP in the first quarter, investors are increasingly looking towards the forthcoming rebound in economic growth rather than dwelling on the negative quarterly figure," Dean Turner, an economist at UBS Global Wealth Management, said.
Growth in February was helped by a first rise in factory output since November, led by car manufacturing after two months of contraction when the industry struggled with a global shortage of microchips.
UK wholesalers and retailers saw a pick-up in sales which helped the services sector to grow by 0.2%.
There were signs that trade between Britain and the European Union partially recovered in February after a hit in January, the first month of a new post-Brexit trade relationship.
British goods exports to the EU, excluding non-monetary gold and precious metals, were 41.4% below year-ago levels in January but partially recovered to be 12.5% below year-ago levels in February.
Imports, which dropped 19.2% on year-ago levels in January, were 11.5% below year-ago levels in February.
Trade volumes between Britain and the European Union rose in late 2020 as businesses stockpiled goods in anticipation of border delays in 2021.
"Despite the evidence of partial recovery from the substantial January falls in some commodities, it is still too soon to determine to what extent the monthly changes in trade for January and February can be directly attributed to the end of the transition period," the ONS said.