Asda also warned shoppers they need to "bring it back to your nearest store where you will be given a refund. You do not need your receipt." It said: "We are very sorry for any inconvenience caused.

An Asda spokesperson said: "We are very sorry for any inconvenience caused. If you would like any further information please contact Asda Customer Relations - 08009520101".

Asda was found to be the cheapest supermarket for nine out of 12 months when researchers compared the total cost of a longer shopping list of 158 goods. However, Tesco was cheaper nearly half the ...