John Lewis’ sales slumped last week following an impressive Christmas performance, with categories down across the board.

Sales fell 4.7% to £98.5m in the week to January 6, but were up 1.5% over the 23 weeks of the half-year overall.

Fashion fell 3% in the week, while electricals sales declined 5.2% and home was down 5.3%.

At sister grocer Waitrose, sales rose 6.9% to £119.58m, but benefited from the fall of New Year’s Eve, which added five percentage points. They crept up 1.6% in the first 23 weeks of the half.

Retail director at Waitrose Ben Stimson said: “With much of the population embarking on New Year resolutions, shoppers were on the lookout for healthier food.

“The introduction of the new Waitrose ‘Good Health’ label, which will be featured on hundreds of nutritious food and drink products, will make it easier than ever for customers to make healthier choices.”

Across the partnership, sales rose 1.3% over the week and 1.6% over the 23 weeks.