Retail sales volumes fell by 0.4% in September against August.
The Office for National Statistics said that sales volumes in non-food stores fell by 1.1% between August and September. This included volume falls for clothing and footwear stores.
However the average weekly value of sales in September was £5 billion, 3% higher than in September 2007.
According to the Office for National Statistics, total sales volume in the three months to September was 2.3% higher than the same period last year - but this is the lowest rate of growth since April 2006.