The Cabinet Office said the economy grew 1.3% in the three months to the end of September, compared to the same period a year ago.
However, that was sharply lower than the previous estimate of 2.2%.
The new data indicated that investment by companies in the quarter had been weaker than initially estimated.
Capital expenditure fell 0.4% in the quarter, as steel and real estate companies reduced investment.
However, consumer spending was revised up, while separate data showed improving sentiment in the services sector.
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