Ongoing promotional activity slowed sales growth in August, although volumes were strong, according to the latest BRC/KPMG sales monitor.
But good weather last month helped boost sales in fresh produce and seasonal fruit and vegetables, as well as ice cream, beers, wines and spirits.
Total sales rose 7.6% in August compared with 6.5% in July and BRC said that retailers remained concerned that the level of growth would tail off in the Christmas run-up.
BRC director general Bill Moyes said: "Recent inflation figures show that the increase in growth is being achieved through volume, not through increased prices or margins. The case for action to maintain consumer confidence therefore remains."

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