Marks & Spencer has maintained its position as Britain's fastest growing food retailer, market researcher NielsenIQ said on Tuesday, indicating its turnaround plan is gaining momentum.
It said M&S's sales rose 12.3% in the 12 weeks to 29 January year-on-year, giving it a UK grocery market share of 3.6%, up 0.4 percentage points on the year.
Last month, M&S nudged up its profit outlook after it reported a strong Christmas, and hopes are rising its latest attempt at a turnaround could succeed after decades of false dawns.
NielsenIQ's data showed market leader Tesco was the best performer of Britain's so-called Big Four grocers.
Its 0.3% sales decline significantly outperformed Sainsbury's, Asda and Morrisons, which had falls of 3.7%, 4.3% and 6.9% respectively.
The data echoed figures from rival market researcher Kantar published last week.
However, Kantar does not include M&S in its monthly reports.
M&S also had weaker comparative sales numbers than the big four in the same period of 2020-21.
NielsenIQ said overall UK supermarket sales fell 2.9% over the four weeks to 29 January.
Comparatives were very tough, as in the same period last year the United Kingdom was in COVID-19 lockdown and sales grew 10.6%.