How We Verify Every Discount Code
Every code on this site is tested against a live booking before it is published and re-tested weekly. Codes that stop working are removed rather than left to expire on the page. This is the full method, published so you can check it. Reviewed 10 September 2026.
Where these codes work
The codes on this site work when you book through our platform — through the quote form on these pages. Every code button opens that form with its own code already in the discount field: the code advertised beside a car park is the code you book with, without retyping it. Our sitewide code BCP25 is worth up to 25% off, and the car-park codes listed on each page carry their own percentages.
That is worth being plain about, because it is the single most common reason a discount code fails. A code taken from this page and typed into an airport's own website, or into a car park operator's own checkout, will usually be rejected — not because the code is dead, but because it is not a code that operator issues. It is a rate negotiated through the booking platform, and the platform is where it applies. The same is true in reverse: a code found elsewhere will not work on our form unless we issued it.
Nothing about this changes the price you pay. The discounted rate you see is the rate you get, and you are free to compare it against booking direct — our operator pages tell you when direct or a rival is cheaper, including for operators we are paid by. The codes are simply not portable, and any site telling you a code works everywhere is not testing them.
Codes are applied at the checkout, before payment, not at the barrier when you arrive. Turning up at a car park with a code and no booking gets you the drive-up price, which is the most expensive way to park at every UK airport without exception.
What we actually do
Each code is entered into a real booking on the operator's own checkout, for dates roughly three weeks ahead, on the cheapest product that operator sells at that airport. If the total does not change, the code does not go on the site. If it changes by less than advertised, we publish the figure we saw rather than the figure advertised.
That last point is where most discount sites diverge from us. A code marketed as 'up to 25% off' frequently delivers 10% on the products people actually book, because the 25% applies to a premium tier. We publish what the code did on the cheapest product, which is a lower number and a more useful one.
How often, and what happens when a code dies
Weekly. Every code on every airport and operator page is re-tested against a live booking once a week, and the date of that test appears on the page as the Last verified line. That date is the single most useful thing on any discount page and most sites do not carry one.
When a code stops working it is removed within that week. It is not moved to an 'expired' section, greyed out, or left in place with a smaller font. This is why some of our airport pages carry six codes where a competitor carries forty — the other thirty-four stopped working and nobody took them down, because an expired listing still earns a click.
Where the prices come from
Every price on this site is a real quote taken from an operator's checkout for a defined booking: eight days, departing within 30 days, on the cheapest product at that airport, unless the page says otherwise. Holding the method constant is what makes the airports comparable.
Prices move — airport car parks price by yield, like airlines — so the figure you see for your dates will differ from ours. What our figures are for is judging whether the price you have been quoted is roughly normal. If you are quoted 50% above our benchmark for a comparable stay, you are probably booking too late or looking at the wrong product tier.
How we make money, and what it does not buy
Airport Parking Discount Codes is operated by Britain Car Parks and earns commission when a visitor books through an affiliate link. That is the entire business model and it is disclosed on every page.
What commission does not do is change what we publish. Our operator pages carry a section asking whether that operator is the cheapest at its airport, and where the answer is no we say so and link to the cheaper option — including for operators we are paid by. At Gatwick we tell readers that APH, an operator we are affiliated with, is beaten by Cophall. That section is the clearest test of whether a discount site is worth reading, and most sites do not run it.
What we get wrong
Prices go stale between weekly checks, particularly in school holidays when operators reprice daily. Drop-off charges change annually and airports do not always announce them prominently. Operator facts — shuttle frequencies, accreditation status, EV provision — change without notice and we find out when we re-check.
If you find something wrong on this site, the contact page reaches a person and we would rather know. Corrections are made the same week and the Last verified date is updated to reflect the re-check.