Tesco will check the prices of all items after a reporter was overcharged in two-thirds of stores
An undercover reporter for BBC Inside Out was overcharged on multi-buy offers at two-thirds of stores visited.
The reporter was charged more than expected in 33 out of 50 stores visited because promotions marked on the shelves were out of date and no longer valid at the tills.
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Multi-buy deals were still being advertised on the shelves months after they had expired in some cases.
Martin Fisher from the Chartered Trading Standards Institute said the errors could break the law by falling foul of the The Consumer Protection from Unfair Trading Regulations 2008, according to the BBC.
The reporter found multi-buy deals were still being advertised months after they had expired
The supermarket giant will now re-evaluate the price of every item at its 3,500-plus Tesco stores across the UK.
We are disappointed that errors occurred
A spokeswoman said: "We take great care to deliver clear and accurate price labels for our customers so they can make informed decisions on the products they buy.
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Luke Shaw makes his way out of a Tesco store
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The full BBC Inside Out investigation will be broadcast tonight
"We are disappointed that errors occurred and will be working with the stores involved to reinforce our responsibilities to our customers."
The full investigation will be broadcast in most English regions at 7.30pm on BBC on Monday.
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