GP Turbos
Last updated 24 October 2026

Cookie policy

This cookie policy lists every cookie this website sets, what each one does and how long it lasts, and explains how we ask before setting any that the site does not need to work.

How we ask for your consent

Cookies are small files that a website stores in your browser, and the same rules cover other browser storage. Some are strictly necessary: without them you could not sign in or stay signed in. Others are not, and UK law says we must ask before setting those.

So on your first visit the site shows a small notice at the bottom of the page with two choices: Accept analytics, or Essential only. Nothing that is not strictly necessary is set until you choose, and ignoring the notice is the same as choosing Essential only. Your choice is remembered in a cookie of its own for six months, after which we ask again.

You can change your mind at any time:

  • Cookie settings in the footer of every page;
  • Cookie settings in the account menu at the top of the page, when you are signed in;
  • the Cookies card on your account settings page.

Declining analytics after accepting it stops the collection and removes the analytics cookies from your browser.

Strictly necessary cookies

These are set without asking, because the site cannot do what you asked for without them. None of them is used for analytics or advertising.

CookieSet byWhat it doesHow long it lasts
sb-<project>-auth-token (sometimes split into .0, .1, … parts, with a -code-verifier cookie during sign-in)Supabase, our sign-in systemKeeps you signed in as you move around the site, including after Google sign-inRemoved when you sign out; otherwise up to 400 days
gpturbos-mfa-trustGP TurbosSet only if you use two-step verification and tick "Remember this device for 14 days"; lets that browser skip the code14 days, or until you choose "Stop trusting this device" in account settings
gpturbos_pw_recoveryGP TurbosSet after you follow a password reset link, so you can choose a new password without entering the old one15 minutes
gpturbos-cookie-consentGP TurbosRemembers the choice you made in the cookie notice6 months
gpturbos-cartGP TurbosRemembers the basket of a visitor who is not signed in30 days
gpturbos-view-as-…GP TurbosUsed only by our staff, to see a page as visitors see itUntil the browser is closed

Our staff's browsers also keep one item in local storage (gp-admin-collapsed-sections), which remembers how they left the admin dashboard laid out. It is never set for visitors or members.

Analytics cookies (only if you accept)

If you accept analytics, the site loads Amplitude, a product analytics service, which sets these cookies:

CookieSet byWhat it doesHow long it lasts
AMP_…AmplitudeA random identifier for your browser, the current visit, and whether you have opted outUp to 1 year, or until you decline analytics
AMP_MKTG_…AmplitudeThe website or search engine that sent you here, and any campaign tags in the link you followedUp to 1 year, or until you decline analytics
AMP_TEST, AMP_TLDTESTAmplitudeChecks that cookies work, while Amplitude startsRemoved straight away

What Amplitude records: the pages you view, when a visit starts and ends, where you came from, and these actions on the site: starting and completing sign-up, signing in, sending an enquiry (the type of enquiry only), subscribing to the newsletter, and accepting or declining analytics. Once you are signed in, your account's internal identifier (a random code) is attached, so we can see how members use the site.

What it never records: your IP address (we have turned that off), your name, email address or phone number, the text of an enquiry or a forum post, or what you type into a form.

Amplitude holds this data in its European Union data centre. How we use it, and the lawful basis we rely on, are in our privacy policy.

Content from other websites

Some pages show content from other websites, which can set cookies of their own when it loads. The map on our home and contact pages comes from OpenStreetMap. Videos, for example in the gallery and on the forum, can come from YouTube, Vimeo, Facebook or Instagram; YouTube videos are shown in YouTube's privacy-enhanced mode. Those websites handle your data under their own privacy policies, and this notice does not control their cookies.

Managing cookies in your browser

Your browser lets you see, block and delete cookies, for this site or for every site; look for "cookies" or "site data" in its settings. If you block or delete the strictly necessary cookies you will be signed out, and you will not be able to sign in again while they are blocked.

Questions about cookies, or about your personal data more generally? See our privacy policy, or contact us.

Changed your mind about analytics? Use Cookie settings in the footer, or ask us anything about cookies.

Cookies

Essential cookies keep the site working. With your OK we also use Amplitude analytics to see which pages help. Cookie policy