NielsenIQ has reported a slowdown in UK grocery growth as major-supermarket sales rose 1.8% in value but unit sales slipped 0.1%, the first decline in volumes since Easter.
The figures cover the four weeks ending 5 September and point to a more cautious start to the autumn after stronger summer trading.
Sales growth at the major supermarkets slowed from the pace recorded during the preceding summer period, while the decline in units indicates that higher cash sales did not translate into more products being purchased.
Trading strengthened over the August bank holiday, when weekly grocery sales reached £4.25bn and increased 3.1% year on year.
Consumers also shifted where they shopped. Sales at larger supermarkets grew more strongly than convenience stores, suggesting a return towards larger planned grocery trips as holiday routines ended.
NIQ’s Mike Watkins said: “September is likely to mark a return to tighter household budgeting.”
The detail beneath the headline shows how category demand changed as the weather cooled and consumer routines shifted.
Alcohol sales were weaker year on year across several categories, while pre-mixed alcoholic drinks continued to grow rapidly. Soft drinks remained comparatively strong and contributed substantially to total value growth.
Online grocery also continued to outperform the wider market. Ecommerce grocery sales rose at a double-digit rate in the latest period, reinforcing the lasting role of delivery and collection after the step change in digital grocery adoption during the pandemic.
The latest data adds a grocery-specific view to recent evidence of weaker UK retail momentum. BRC-KPMG figures for August showed slower retail sales growth, although the two datasets measure different parts of consumer spending and use different methodologies.
The distinction between value growth and unit growth is particularly important. A retailer can report higher cash sales even where consumers take home the same number of products — or fewer — if average prices or product mix are higher.
A 0.1% decline in units is modest, but its direction means supermarkets cannot rely solely on expanding volumes as households reassess spending after summer.
That creates competing priorities. Retailers need to protect margins after several years of labour, logistics, property, and supplier cost increases while also demonstrating value to customers whose budgets remain under pressure.
Loyalty pricing, own-label products, promotions, pack sizes, and personalised offers have all become tools for balancing those requirements.
The continued growth of online grocery adds another operational consideration. Ecommerce can increase convenience and customer retention, but picking and delivering individual orders carries fulfilment costs that differ markedly from conventional store shopping.
NIQ’s latest figures also show substantial variation between individual grocers, demonstrating that share continues to move even when the overall market grows slowly.
That makes competitive execution more important. In a market with weak unit growth, a retailer seeking expansion needs either to win customers from rivals, increase shopping frequency, persuade households to spend more per visit, or capture growth in stronger product categories.
Consumer preferences are shifting within the basket as well. NIQ identified increased spending on some healthier-positioned products alongside renewed interest in store-cupboard and comfort-food categories as temperatures cooled.
Those changes create opportunities for brands, but slower total volume means suppliers increasingly depend on taking share, securing distribution, innovating into faster-growing categories, or persuading customers to trade into higher-value products.
For supermarkets, the approach to the final quarter will be shaped by whether September’s tighter spending persists. Grocery is more defensive than many discretionary retail categories, but households can still switch brand, channel, pack size, and product when budgets are stretched.
The figures therefore describe a market still growing in cash terms but becoming more competitive beneath the headline. If unit volumes remain subdued, retailers and suppliers will have to work harder for incremental sales growth as the peak Christmas trading period approaches.
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