How to make sure you really are saving on Black Friday bargains

Our secret shopper has a few tips and tricks to help you find the real deals this year
In all the hype around Black Friday, figuring out whether the discount is a good buy or not can be tricky. Which? recently published research showing that out of 178 deals publicised on Black Friday in 2015, only 90 were actually cheaper than they had been before the sale day.Retailers from Currys to Amazon all mark their Black Friday deals with magnificent-sounding price cuts, but they are only really useful