Marks and Spencer saw sales fall over the key Christmas period, while Tesco reported record trading over the festive season.
M&S said its like-for-like revenues fell 1.4% in the 13 weeks to 30 December. Clothing and homewear fell 2.8%, while food was down 0.4%.
By contrast, Tesco’s UK sales rose 2.3% in the 19 weeks to 6 January.
The supermarket said it saw “record sales and volumes” in the four weeks leading up to Christmas Day.