• McVitie’s Digestives dark chocolate biscuits have decreased from 332g to 300g – a 10% reduction. In Tesco these biscuits were sold for £1.59 before they shrank and actually increased to £1.69 after.

• Tropicana Creations Pure Premium Orange & Raspberry juice decreased from 1 litre to 850ml, a 15% reduction.This remained on at the same price of £2.48 in Asda after it shrank in size.

• Dettol Power and Pure Bathroom Wipes decreased from 36 to 32 wipes, an 11% reduction.These were on sale at £2 in Tesco and Ocado before they shrank. They remained at £2 in Tesco and went up to £2.03 in Ocado afterwards

• Sensodyne Total Care Extra Fresh Toothpaste decreased from 100ml to 75ml, a 25% reduction.Tesco had this on sale at ‘£2.40 was £3.60’ before it shrank. Then £3.49 after it was reduced in size, which is more per 100ml.

• Percol Fairtrade Guatemala Coffee decreased from 227g to 200g, a 12% reduction. This coffee was £3.90 in Sainsbury’s and Waitrose before it shrank, and £3.65 and £3.75 respectively after – both more per 100g.

Which? editor Richard Headland said ”Shrinking products can be a sneaky way of increasing prices. We want manufacturers and supermarkets to be upfront about shrinking prices so consumers aren’t misled.”

Four in five consumers that were polled by Which? believe it is wrong for groceries to get smaller and cost the same – especially if shoppers aren’t told about the changes.

However some of the brands responded to the research and said it was up to supermarkets to decide their prices, they did not reveal whether they had charged lower wholesale prices for the shrunken products.

Do you feel cheated paying the same (or even more in some cases) by the shrunken products?

Who is to blame, the supermarkets or the manufacturers?