Prime Big Deal Days: how to tell a real discount from a fake one

When it runs and who it is for

Amazon has announced that Prime Big Deal Days returns from 6 to 7 October 2026 in the UK. The event starts at 00:01 BST on 6 October and ends at 23:59 BST on 7 October. Deals are for Prime members across categories including home, kitchen, electronics, toys, fashion and beauty. The event is not open to non-members, so the cost of membership is part of the calculation for anyone thinking about joining specifically to shop the sale.

Prime membership in the UK costs 8.99 pounds a month or 95 pounds a year. A 30-day free trial is available, and it converts to a paid membership unless cancelled. That auto-renewal point matters for anyone timing a trial around a two-day event: a trial started shortly before 6 October 2026 will roll into a paid month unless it is cancelled before the trial ends. The membership cost is a fixed outlay, while the value of any deal depends on the price paid against a genuine reference price. A discount is only a saving if the item would have been bought at or near the higher price anyway, and if the higher price was real rather than a figure created for the sale.

What a was-price legally has to mean

The Price Marking Order 2004 governs how selling prices and unit prices must be shown to consumers in the UK. Alongside it, the Competition and Markets Authority has published guidance on reference pricing, and the framework for unfair commercial practices is set out in the CMA's unfair commercial practices guidance CMA207, published in final form in April 2025. The CMA also published final price transparency guidance on 18 November 2025, covering invitations to purchase and how total prices, including mandatory fees, must be presented. The practical effect is that a comparison price should be a price that was actually charged, not an inflated figure invented to make a discount look larger.

For a shopper, the question to ask is simple: was this item genuinely on sale at the was-price, and for how long? A reference price that appeared briefly, or only on paper, is a weak basis for a claimed saving. The CMA207 framework treats misleading price claims as unfair commercial practices, and the price transparency guidance addresses how total prices must be presented at the point of invitation to purchase. That means the figure first shown should be the figure actually payable, with mandatory fees included rather than added later. Where a retailer shows a percentage saving, the reference price behind that percentage is the thing to test against price history and against other retailers.

What the DMCC Act banned in 2025

The consumer provisions of the Digital Markets, Competition and Consumers Act 2024 took effect on 6 April 2025, replacing the Consumer Protection from Unfair Trading Regulations 2008. From that date, drip pricing is a banned practice: showing a headline price and then adding mandatory charges later in the journey is prohibited, and mandatory charges must be included in the price first shown. Fake reviews are also banned. Writing, commissioning or submitting fake reviews, publishing incentivised reviews without clearly disclosing the incentive, and concealing or removing genuine negative reviews are all unfair practices. Businesses must also take reasonable and proportionate steps to prevent fake reviews appearing.

Enforcement changed at the same time. The CMA has direct enforcement powers under the DMCC Act and can impose fines of up to 10 percent of global turnover for breaches of consumer protection law. That is a significant shift from the previous regime, which relied more heavily on court action. The CMA has used the powers: in March 2026 it opened five investigations into fake and misleading reviews across the funerals, food delivery and car sales sectors. For shoppers during a sale event, the practical relevance is that a headline price which grows at checkout, or a review score built on incentivised or fabricated reviews, is now a matter of banned practice rather than a grey area. The rules apply to the market generally, not to one retailer, and nothing here is a statement about whether any particular company complies.

How to check a price yourself

Price history tools track an item's price over time and can show whether the current figure is genuinely low or merely back to a level seen for most of the year. Some retailers display their own price history on the product page, which allows a direct check against the was-price. A second check is to look at the same item at two or three other retailers. If the item is widely available at or below the sale price, the claimed saving is weak. If it is consistently higher elsewhere, the deal is stronger, though stock, warranty and delivery terms still differ between sellers.

Watch for changes that make comparison impossible. A changed model number, a different bundle, or an added accessory can break a like-for-like comparison with last month's price or with a rival's listing. Retailers sometimes use a variant or bundle to reset the reference price, so the model number on the listing is worth checking against the model number of the item being compared. Unit price matters too, particularly for household and kitchen goods sold in different sizes. The Price Marking Order 2004 requires unit prices to be shown in defined cases, which allows a direct comparison between pack sizes. Combining price history, cross-retailer checks and unit price gives a clearer picture than the discount badge alone.

If the deal goes wrong

Consumers buying online generally have 14 days from receipt to cancel most orders under distance selling rules. This is a statutory right and is separate from a retailer's own returns policy, so a retailer cannot remove it by setting a shorter window. It covers most goods bought online, though there are exceptions, including some personalised items and sealed goods unsuitable for return for hygiene reasons. Where the cancellation right applies, the shopper does not need to give a reason, though return postage terms depend on the retailer's policy and the reason for return.

Separately, the Consumer Rights Act 2015 gives rights where goods are not of satisfactory quality, not fit for purpose or not as described. Those rights apply regardless of any sale, and a discount does not reduce them. For faulty or misdescribed goods, the first step is usually a repair, replacement or refund from the retailer. Where a credit card was used, Section 75 of the Consumer Credit Act 1974 makes the credit card provider jointly liable with the seller for breach of contract or misrepresentation where the cash price is over 100 pounds and up to 30,000 pounds. For debit card purchases, chargeback is a card scheme process rather than a statutory right, and it can help where goods do not arrive or are not as described. These routes sit alongside the 14-day cancellation right rather than replacing it.

How to complain

The first step is the retailer. A written complaint should set out the order, the price paid, what was expected and what is being sought, whether that is a refund, a replacement or a correction to a misleading price claim. Keeping screenshots of the listing, the was-price and the checkout total helps, particularly where a mandatory fee appeared late in the journey. If the retailer does not resolve the matter, the next step for an individual dispute is Trading Standards, usually reached through Citizens Advice. Trading Standards handles consumer protection matters at a local authority level and can act on patterns of complaints.

The CMA is a separate route, aimed at market-wide practices rather than individual disputes. Its direct enforcement powers under the DMCC Act, including fines of up to 10 percent of global turnover, are used against practices affecting consumers generally, such as drip pricing or fake reviews. That means a single unresolved order is unlikely to be taken up by the CMA directly, but evidence of a wider practice can feed into its work, as shown by the five investigations opened in March 2026 into fake and misleading reviews. For most shoppers, the sequence is retailer first, then Citizens Advice and Trading Standards, with the CMA relevant where the issue looks systemic rather than one-off.

Source: CMA: unfair commercial practices guidance (CMA207).

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Frequently asked questions

When does Prime Big Deal Days run in 2026?

It runs from 6 to 7 October 2026 in the UK, starting at 00:01 BST on 6 October and ending at 23:59 BST on 7 October. Deals are for Prime members across categories including home, kitchen, electronics, toys, fashion and beauty.

How much does Prime membership cost in the UK?

Prime membership costs 8.99 pounds a month or 95 pounds a year. A 30-day free trial is available and converts to a paid membership unless cancelled.

What did the DMCC Act ban from 6 April 2025?

From 6 April 2025, drip pricing and fake reviews are banned outright. Mandatory fees must be included in the headline price, incentivised reviews must disclose the incentive, and the CMA can fine up to 10 percent of global turnover.

What does a was-price legally have to mean?

Under the Price Marking Order 2004 and CMA guidance including CMA207, a comparison should be against a price actually charged. The CMA's price transparency guidance of 18 November 2025 covers how total prices, including mandatory fees, must be presented.

How can a shopper check whether a discount is genuine?

Use price history tools, check the retailer's own price history display, compare the same item at two or three other retailers, and watch for a changed model number or bundle that makes comparison impossible.