had failed to take inflation into account when analysing prices, and stressed that they adhered to Trading Standards rules on promotions.
Inflation has been at its highest for decades in recent months, with food prices hitting record levels.
was a jar of Nescafe Gold Blend Instant Coffee (200g) advertised at Sainsbury's for £6 with a Nectar card - a saving of £2.10 on the regular price of £8.10.
said it had shared its findings with the Competition and Markets Authority (CMA) and asked it to look at whether supermarkets could be hiking their regular prices to make loyalty scheme customers feel they are getting a discount.
A CMA spokesperson said: "Grocery prices are a huge concern to people all over the country and shoppers need help to spot the best value for their money.
That's why the CMA has a programme of work in the groceries sector such as looking into unit pricing practices online and instore.
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