Apart from German-owned discounter Lidl GB, Marks & Spencer (MKS.L) was Britain's fastest growing supermarket in the Christmas quarter, industry data published on Tuesday showed.
Researcher NIQ said M&S's food sales on a value basis rose 12.1% in the 12 weeks to Dec. 30 year-on-year, with its share of the UK grocery market rising 0.1 percentage point to 3.8%.
Almost 29% of households shopped at M&S in December, up from 27% in the same period last year, equating to 500,000 new shoppers, it said.
M&S's food shopper numbers always jump at Christmas. Its challenge is to retain them for the rest of the year.
The group, which also sells clothing and homewares, will update on Christmas trading on Thursday.
Echoing data from rival market researcher Kantar last week, NIQ said market leader Tesco (TSCO.L) and No. 2 Sainsbury's (SBRY.L) also performed robustly with sales up 7.4% and 8.7% respectively, but privately owned Asda and Morrisons were laggards with growth of 3.2%. Kantar's monthly report does not include M&S.
Tesco will also update on Christmas trading on Thursday, a day after Sainsbury's.
NIQ said total supermarket sales in cash terms reached 4.8 billion pounds ($6.1 billion) during the week ending Dec. 23, the biggest week on record and an increase of 4.3% on Christmas 2022. Sales on a volume basis rose 1.2%.
The researcher said confectionery was the highest performing category in December with 17.3% value growth but value sales for beers, wines and spirits slowed to 1.6% with volumes down.
Separately on Tuesday, data from the British Retail Consortium showed lacklustre overall UK retail sales around Christmas, which may add to concerns that the economy has tipped into a mild recession, less than a year before a likely national election.
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