Most Black Friday deals at some of the country's biggest retailers are cheaper or the same price at other times of year, according to a Which? study.

In its study of last year's Black Friday season, the consumer champion found eight out of 10 products were not at their best price.

It tracked 175 items from eight major retailers in the year to May and found 83% were cheaper or equal in price at least once outside the four-week Black Friday period (15 November to 12 December).

We've outlined the findings below - and some pretty robust responses from the retailers involved.

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John Lewis was one of the worst culprits, with Which? finding 94% of products were cheaper or the same price at another time of year.

One example of an apparently dud deal found

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