UK retail sales last month showed their weakest year-on-year growth for any December since 2008, by value rather than volume, industry figures have revealed.

The figures, published today by the British Retail Consortium, show the value of retail sales last month was up only one per cent on December 2013. This marked a sharp slowdown in year-on-year growth from 2.2 per cent in November, when sales were boosted by the Black Friday discounting frenzy.

However, the BRC noted the value of food sales had in December shown year-on-year growth for the first time since last April.

And it highlighted its estimate that shop prices in December were, overall, down by 1.7 per cent on the same month of 2013. On this basis, it calculated UK retail sales in December were up by a rounded 2.6 per cent in terms of volume, as opposed to value.

Edinburgh-based David McCorquodale, head of accountancy firm and BRC survey sponsor KPMG's UK retail sector practice, said: "Extensive discounting disrupted the timing and rhythm of Christmas spending. Between Black Friday and Boxing Day, retailers and consumers engaged in a three-week dance, each waiting for the other to take the lead, and as a result sales suffered."

He added: "It's now clear Black Friday did pull festive sales forward into November, and this created a challenging lull in spending with consumers waiting for future bargains. This situation did not reverse until the week of Christmas. The launch of Boxing Day sales mixed with new season full-price stock saw some phenomenal spending, with fashion retailers achieving double-digit [percentage] growth."