Deal breakers Were 2016 savings too good to be true?

Neff Slide and Hide Oven on offer at Currys for £494.99 for Black Friday was cheaper for at least 113 other days of the year and £45 less expensive three weeks later.

An Oral B electric toothbrush from Amazon was advertised as “save 26%: was £40.49, now £29.99”. It was £5 cheaper on at least two days in July 2016, four months before Black Friday.

Samsung 55-inch Smart 4K Ultra HD curved TV advertised in Currys PC World as “Save £400, now £849”, but was £50 cheaper at least 29 times in December, January and April, the same price at least seven times in April and £79 cheaper at least 18 times in May.

A 49-inch LG TV advertised in Argos at £499 as “Our lowest price” was £4 cheaper a week later and another £16 cheaper at the end of December.