Robust capital spending boosted the new quarterly figure sharply higher than the preliminary 0.3 percent and beat market expectations that growth would be revised up only slightly.

The data confirmed the economy grew for the seventh straight quarter in the longest string of gains for more than two decades.

Capital spending -- investment in equipment and plants by private firms -- was revised from 0.2 percent to 1.1 percent.

The Cabinet Office said the economy grew at an annualised 2.5 percent, instead of an earlier estimated 1.4 percent.