British services sector expanded at its weakest rate in over two years casting doubt about sustainability of economic growth into third quarter, a closely watched survey revealed Thursday.

The services Purchasing Managers' Index dropped to 55.6, which was the weakest score since May 2013, survey results from Markit Economics and the Chartered Institute of Procurement & Supply showed.

That was in contrast to economists' expectation for a modest improvement in the reading to 57.7 from 57.4 in July. The growth slowed for second straight month.

A PMI score above 50 indicates expansion in the sector and the latest reading remained above the long-run survey average of 55.2. Further, activity has now grown for 32 consecutive months, which was the second-longest sequence of growth since the survey started in July 1996.

The economy looks set to grow by 0.5 percent in the third quarter, down from 0.7 percent in the three months to June, with the ongoing upturn almost entirely dependent on the service sector, Chris Williamson, chief economist at Markit, said.

The construction sector sustained its growth momentum in August, while manufacturing expansion slowed from July, survey results from Markit showed this week.

IHS Global Insight's Chief UK Economist Howard Archer said, the overall weak set of PMI survey results will likely fuel the belief that the Bank of England will not be raising rates until well into 2016.

Business received by service providers rose for the thirty-second straight month in August. Nonetheless, the pace of expansion slowed since July to the weakest since April 2013.

Despite the slowing in the growth pace, services firms added more staff during August and at a faster rate than July's recent low. Though, the rate of job creation was slower than those registered during the first half of 2015.

Inflationary pressure on input costs eased further as input price inflation slowed for a third straight month to hit the weakest since January. At the same time, prices charged by service providers rose only marginally, the survey said.

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