Hundreds of deals including limited quantity, limited time Lightning Deals over five days from:
Monday, November 21 to Friday, November 25.
Amazon UK

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You shouldn't have to stand in a long line to get a great deal. We're searching for the best Black Friday deals everywhere--including Black Friday deals other stores are planning--so we can meet or beat their prices and bring them to you even earlier. These limited-supply deals will go quickly, but we'll add new ones throughout the day, every day, so you can skip the long lines and still save a bundle
Amazon US

Even though it doesn't say so, I assume the US ones will be going all week too.