Marks & Spencer noted a fall in revenues in both its food and its clothing and home departments in the 13 weeks to 30 December, the retailer said in a trading statement on Thursday.
The company said its food business experienced ongoing trading pressures as consumer spending reflected tighter household budgets after wage growth during the second half of the year failed to keep pace with consumer price inflation.
Third quarter trading
In its financial third quarter, M&S reported a 0.1% fall in total group sales to £3.167bn. In the UK total sales were up 1.1% to £2.858bn, but on a like-for-like basis - in stores open a year or more where comparable figures can be taken - UK sales were down 1.4%.
Food sales rose 3.6% on a total basis to £1.666bn, but like-for-like food sales were down 0.4%.
Clothing and home sales were down on both metrics: 2.3% lower on a total sales basis to £1.192bn - down 2.8% like-for-like.
International sales were down 9.8% to £309m.
Steve Rowe, chief executive, said: "M&S had a mixed quarter with better Christmas trading in both businesses going some way to offset a weak clothing market in October and ongoing underperformance in our Food like-for-like sales. As a result, full year guidance remains unchanged.
"We continue with the accelerated transformation programme we outlined in November and have recently taken several important steps to reshape the business for the future."
Shares in M&S were lower in opening trade, down 2.04% to 317.4p on the London Stock Exchange.