In total, the basket of 42 groceries would have averaged around £11 more at Sainsbury’s Local and £10 more at Tesco Express for loyalty scheme members, compared to their price

An investigation has found that Tesco, Morrisons and Sainsbury's all charged more for a basket of shopping in their smaller local convenience stores.

A 500g bag of own-label fusilli was 31 per cent or 20p cheaper at a larger Sainsbury's supermarket at 65p instead of 85p. A medium white Hovis loaf cost 12 per cent more at both Sainsbury's Local and Tesco Express, and 14 per cent more at Morrisons Daily.

Morrisons Daily, Sainsbury’s Local and Tesco Express against prices at their full-sized supermarkets on three occasions in June and July, also checking loyalty scheme discounts. It found the biggest price difference for the basket was at Morrisons Daily,