The UK's economy grew by 0.1% between July and September, according to the latest official figures.
Growth was lower than expected and the Office for National Statistics said activity was subdued across most industries during the three months.
Labour made boosting economic growth its top priority when it came into power, and on Thursday the chancellor announced plans to reform the pensions sector to try to boost investment.
However, many businesses have criticised tax rises in the Budget which they say will hit employment and push up prices.