Storm clouds have gathered on Britain’s high street after a shock fall in retail sales and a slew of pessimistic comments from major players.

Figures from the Office for National Statistics (ONS) revealed a surprise sales fall of 0.5 per cent in August, bringing to an end six months of growth and signalling a turn for the worse in consumer spending.

Retail bellwether John Lewis and Comet parent Kesa Electricals joined a growing number of major players to flag concerns about the outlook, after fashion chain Next forecast a period of low growth.

The sector is bracing itself for a fallout from next month’s government spending review and the rise in VAT to 20 per cent next January.

The figures from the ONS were described as “awful” by economist James Knightley at ING Bank, coming against market expectations for growth of 0.3 per cent.

It was the worst retail sales result – and first fall – since January.

The ONS also revealed that sales growth in July was not as good as initially calculated, revising the result down to 0.8 per cent from 1.1 per cent previously.

Vicky Redwood at Capital Economics said: “August’s fall in retail sales could be the first sign that the surprising resilience of consumer spending recently could be coming to an end.”

But she cautioned against reading too much into one month’s reading.

Three-month data from the ONS showed a rise of 1.4 per cent on the previous quarter, while sales were still ahead year-on-year in August, up 0.4 per cent.

In the month-on-month data, non-food stores were the worst hit, with sales down 0.7 per cent, driven largely by household goods stores.

Food stores saw a decline of 0.5 per cent, according to the ONS.

The sector has seen sales ease back after the World Cup boost in early summer trading and as shoppers rein in their spending.

John Lewis reported a slowing in sales growth across its department stores, to 8.8 per cent in the six weeks since July 31 from 12.3 per cent in the first half.

Charlie Mayfield, chairman of John Lewis Partnership, said: “For the remainder of this year and into 2011, we anticipate more challenging trading conditions as higher taxes and public spending cuts begin to bite and household disposable incomes come under pressure.”

However, the group remains confident it will continue to outshine the market after a robust first half.

It saw group profits surge 28 per cent to £110.5 million in the six months to July 31.

Kesa Electricals also beat analyst expectations with its first quarter trading, showing a 4.3 per cent rise in sales at Comet in the UK. And while sales have been under pressure, retailers such as Next and B&Q owner Kingfisher have shown that they have been successful in protecting profit margins.

Economists predict July’s strong figure from the ONS will mean that retail sales still contribute to UK gross domestic product in the third quarter, according to analysts.

“Nonetheless, the pressures on consumers are clearly mounting and the outlook for spending remains pretty bleak,” said Ms Redwood.

The disappointing retail result also comes a day after UK unemployment figures showed signs of a relapse in the jobs recovery.

CEBR economist Shehan Mohamed said: “The news will raise further questions over the strength of domestic demand in the UK over the medium-term, as export performance has remained below expectations and budget cuts are to be phased over the next five years from next April 2011.”

Shadow chancellor Alistair Darling said: “Today’s fall in retail sales is only one month’s figure, but it’s a worrying sign. There is now a growing body of evidence that the coalition’s Budget, and sloppy rhetoric, have given consumer confidence a real knock.

“That’s the last thing we need at a time when securing the recovery is the top priority.”

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