Summary
- Strictly necessary technologies run the site and protect our forms. They don’t need consent.
- Analytics and advertising cookies are set in the EEA, UK and Switzerland only after you consent.
- You can change your choice anytime via Cookie settings at the bottom of every page.
What cookies and similar technologies are
Cookies are small files a website stores in your browser. Similar technologies include your browser’s local and session storage, and scripts that read details of your device. EU and UK rules require clear information and your consent before a site stores or reads information on your device, unless it is strictly necessary for a service you asked forSource 1Source 2.
The categories we use
- Strictly necessary. Needed to deliver the site, remember your consent choice and protect our forms from bots. These don’t need consent.
- Analytics. Help us understand how pages are used so we can improve them: Google Analytics 4 and Microsoft Clarity.
- Advertising. Used by Google AdSense to show and measure ads and to prevent fraud. We don’t show ads yet; these cookies are set only once we do.
How consent works
In the European Economic Area, the UK and Switzerland, analytics and advertising storage is set to “denied” by default using Google Consent ModeSource 6. A small cookie banner asks whether you allow analytics cookies, with Accept and Reject buttons of equal size. Your choice is passed to Google Analytics through Consent Mode, and to Microsoft Clarity, which sets no cookies when consent is deniedSource 9. Clarity only loads after you accept, wherever you are.
When we start showing ads, Google’s own consent message will replace our banner, because Google requires a certified consent message for serving personalised ads in those regionsSource 7.
Outside those regions, analytics and advertising storage is allowed by default. You can still block or delete cookies in your browser, and turn off personalised ads in Google’s ad settingsSource 5.
To change your choice, select Cookie settings at the bottom of any page.
Cookies and technologies by provider
Names, purposes and durations below come from each provider’s own documentation, linked in the last column. Providers can change their cookies, so their lists are the up-to-date reference.
| Provider and category | Name | Purpose | Duration | Provider’s documentation |
|---|---|---|---|---|
| Google Analytics 4 (analytics) | _ga |
Distinguishes users | 2 years | GA4 cookie usageSource 3 |
| Google Analytics 4 (analytics) | _ga_<container-id> |
Keeps session state | 2 years | GA4 cookie usageSource 3 |
| Microsoft Clarity (analytics) | _clck |
Keeps the Clarity user ID and preferences for this site | Not stated by Microsoft | Clarity cookiesSource 8 |
| Microsoft Clarity (analytics) | _clsk |
Connects page views into one session recording | Not stated by Microsoft | Clarity cookiesSource 8 |
| Microsoft Clarity (analytics, third-party) | CLID, MUID, ANONCHK, MR, SM |
Microsoft identifiers set by Clarity’s script | Not stated by Microsoft | Clarity cookiesSource 8 |
| Google consent message (strictly necessary) | FCCDCF |
Listed by Google as “Functionality” | 13 months | Google ad product cookiesSource 4 |
| Google consent message | FCNEC |
Listed by Google as “Analytics” | 365 days | Google ad product cookiesSource 4 |
| Google AdSense (advertising, once ads run) | __gads, __gpi |
Advertising and security | 13 months | Google ad product cookiesSource 4 |
| Google AdSense (advertising, once ads run) | __eoi |
Security | 6 months | Google ad product cookiesSource 4 |
| Cloudflare Turnstile (strictly necessary) | Signals and cookies set by Turnstile | Checking that a form is sent by a person, not a bot | See Cloudflare’s documentation | Turnstile privacy addendumSource 10 and Cloudflare cookiesSource 11 |
Cloudflare says the signals Turnstile collects are strictly necessary to detect and block botsSource 10. We load Turnstile only to protect our forms.
Browser storage we set ourselves
| Where | What it stores | How long |
|---|---|---|
| Footprint calculator | Your answers, so they survive a page reload | Session storage, cleared when you close the tab |
| Buy bar on mobile | That you closed it, so it stays closed | Session storage, cleared when you close the tab |
| Cookie banner | Your analytics choice (htbcc-consent) |
Local storage, until you change it or clear site data |
Neither is sent to us.
How to control cookies
- Use Cookie settings at the bottom of any page to change your consent choice.
- Block or delete cookies in your browser settings. Blocking strictly necessary technologies may stop our forms from working.
- Turn off personalised Google ads in Google’s ad settingsSource 5.
Read our privacy policy for how we handle personal data, and use our contact form for questions.