Not every "50% off" tag is what it looks like. UK consumer law gives retailers a fair amount of latitude on how they display reference prices, and some take more advantage of that than others. Here's how to tell when a discount is real, and when you're being played.
1. Check the price history, not the sticker
The single most reliable test is to look at what the product actually sold for in the weeks leading up to the "sale". A discount from a recently inflated reference price is no discount at all. Three free tools that do this for UK shoppers:
- CamelCamelCamel — tracks Amazon UK prices over months and years. If today's "deal" matches the average price of the last 90 days, it's not a deal.
- Keepa — similar to Camel, with a browser extension that shows price history right on the Amazon product page.
- PriceSpy / PriceRunner — compares the same product across multiple UK retailers and shows historical pricing.
If a retailer claims "was £299, now £149" but the historical chart shows the product has been £160 for six months, the £299 reference price is meaningless. The CMA (Competition and Markets Authority) has guidance saying reference prices should reflect genuine, recent selling prices — but enforcement is patchy.
2. Read the small print on "RRP"
"RRP" (recommended retail price) is set by the manufacturer, not the retailer. Many retailers never actually charge RRP — they just use it as a high anchor to make their everyday price look like a discount. If you see "RRP £500, our price £300" but the same product is £310 at three competitors, the "saving" is largely fictional.
3. Beware the "limited time" trap
Countdown timers, "only 2 left!" badges, and "deal ends in 4 hours" banners are conversion tools, not honest information. Many sites cycle the same "deal" with the same countdown indefinitely. Some genuinely sell out fast; most don't.
If you're tempted to buy something purely because a timer is ticking, close the tab, come back tomorrow, and see if the same "deal" is still running. Nine times out of ten it is.
4. Watch for the size and spec swap
This one catches a lot of UK shoppers around Black Friday. A retailer advertises a TV at a huge discount — but it's a slightly different model number than the one being reviewed. The "deal" model might have a lower refresh rate, a worse panel type, or fewer HDMI ports than the version reviewers loved.
Before buying anything based on a "this product is highly rated" assumption, copy the exact model number into a Google search and check the spec matches what the reviews actually covered.
5. Multipack maths
Supermarkets are particularly fond of multipack "deals" that work out the same as — or more expensive than — buying singles. Always check the unit price. UK supermarkets are legally required to display per-100g, per-litre, or per-unit pricing on shelf edges, and most apps show it too. A "3 for £10" deal on something normally £3.30 is a 1% saving, not the bargain it implies.
What "real" looks like
A genuine deal has:
- A price below the 90-day average at that retailer
- A price below or matching the lowest competitor on PriceSpy/Keepa
- No suspiciously inflated "was" or RRP figure being used as the reference
- The same specification as the model being reviewed favourably
- Honest stock and delivery info (not artificial scarcity)
On Invisuale, every deal is sourced from a community vote — meaning real shoppers cross-referenced the price against competitors before upvoting it. That doesn't make us infallible, but it's a stronger signal than a single retailer telling you they've slashed the price.
If you've been misled
If a retailer's "was" price is provably fictional, you can complain to Trading Standards or the CMA. In practice, individual complaints rarely move the needle — but voting with your wallet does. Stop buying from retailers who consistently use dodgy reference pricing, and tell your friends.