Leading grocer Tesco has reported a sales increase in its first quarter, when online revenues rose strongly.

Tesco generated a 1.8% advance in like-for-likes at its core UK business, while group sales on the same basis were up 1% in the 13 weeks to May 30.

Online sales in the UK advanced 8.9% as Tesco expanded its Whoosh rapid delivery service, and the grocer’s net promoter score was up six points to 31.

Tesco chief executive Ken Murphy said: “I am pleased with our progress in the first quarter, with customer satisfaction up strongly and continued sales growth building on the exceptional performance we delivered last year. 

“With the conflict in the Middle East creating ongoing uncertainty for many households, we remain focused on giving customers the very best combination of price, quality, and service. 

“We extended Aldi Price Match to over 2,000 Express stores during the quarter, helping customers benefit from great value wherever and however they shop with us. We are also investing in innovation and quality, with over 520 new and improved products launched during the period, including our largest ever Finest deli transformation and a further expansion of our Tesco High Protein range.

“Shopping at Tesco is ever more convenient and personalised, with the rollout of ‘book for later’ Whoosh delivery slots offering more options for same-day delivery, and Your Clubcard Prices providing nearly 100 million tailored offers for customers since launching in March. Tesco Media is growing strongly, with the World Cup providing exciting opportunities to help us connect brands and customers.”