A guest charged £3.50 for a jug of tap water writes a one-star review. A guest charged £4.00 for a jug of tap water, having been told when they sat down, does not. The difference in money is fifty pence in your favour. The difference in outcome is a review that will still be near the top of your profile next Christmas.
This is the most reliable finding in the whole of review analysis: money complaints track the moment of discovery, not the size of the charge. Which makes them the cheapest category of complaint you will ever fix, because the remedy is a sentence.
Here are the nine places a guest can be surprised, roughly in the order they meet them.
1. The booking
Deposits, card holds, minimum spends, cancellation fees, and time limits on the table. A ninety-minute limit that appears in the confirmation email is a condition. The same limit mentioned by a server at minute eighty-five is an eviction, and it gets written up as one.
Say it at the point of booking, in the confirmation, and never again.
2. The menu you are advertising versus the menu you are serving
Different weekend pricing, a market-price fish, a set menu that does not run on Saturdays, the online menu that is eight months old. Guests do research now and arrive with a price in their heads that came from your own website.
The single most common version of this is an out-of-date PDF. Check yours today.
3. Bread and covers
Charged bread is entirely reasonable and generates complaints out of all proportion to its price, because it arrives looking like hospitality and appears on the bill looking like a trick.
Ask rather than deliver: "would you like bread, it's £4?" That one question removes essentially all of these.
4. What "comes with"
The largest source of this whole category. A main described without its accompaniments, where the guest assumes chips and discovers a £4.50 side. The revenue is identical either way; only the framing differs.
Write the dish at the price it takes to be a meal, or state the sides explicitly under it.
5. Water
Tap water charges, a jug policy, or the server who asks "still or sparkling?" and returns with £6 of bottled water. That last one is not a pricing decision, it is a script failure, and it is the version guests find most insulting because it feels engineered.
Train the answer "we've got tap, or bottled at £4.50 — tap's fine?"
6. Modifications and swaps
A 50p charge for a sauce on the side, £2 to swap chips for salad. These are defensible and need saying at the moment of asking.
The rule is that no charge should ever appear on a bill that was not spoken aloud when it was incurred.
7. The service charge
Discretionary, added automatically, applied to small tables, applied to takeaway. This is the most-complained line item in British hospitality and approximately all of it is discovery.
Print it on the menu, mention it when you seat, and make removing it genuinely easy. A guest who knows how to remove it usually does not.
8. Card and payment surcharges
Surcharges, minimum card spends, a machine that defaults to a 12.5 per cent tip prompt on top of an included service charge. The double-tip prompt is worth checking on your own terminal — plenty of operators do not know theirs does it.
This is the last thing that happens in the visit and therefore what the review gets written about.
9. What happens when something goes wrong
Whether a returned dish is still charged, whether a comp is offered. Not a posted policy, but guests absolutely treat it as one, and "and they still charged us for it" is a sentence that turns a service failure into a value review.
Decide the rule before service, so the answer does not depend on which manager is on.
Running the audit
It takes about an hour and needs one person who has not seen your menu before. Walk them from booking to payment and record every moment they say "oh, is that extra?". That reaction is the finding. There is no need to interpret it.
Then check the reviews for corroboration. Search your own review text for charge, extra, service, added, water, bread, surcharge and cheeky. Most operators find their money complaints concentrated in two of the nine, and both fixable with wording.
The part that is genuinely a judgement call
None of this is an argument for charging less. It is an argument for charging the same amount visibly. A restaurant that includes sides and prices the main accordingly has not lost revenue; it has moved the number to a place where the guest evaluates it once, on the menu, rather than twice — once on the menu and again, worse, on the bill.
Where it gets harder is the service charge, because visibility genuinely reduces the take. That is a real trade and worth deciding deliberately rather than drifting into. The complaints, though, are almost entirely about the discretionary charge being difficult to decline, not about it existing.
Money complaints arrive in ones and twos and each looks too small to act on, which is why the same charge generates the same review for three years. OMMU keeps the count by cause, so what lands is "eleven mentions of the service charge this quarter, nine of them saying they did not know" — which is a different conversation from reading one annoyed review on a Sunday.