Cookie policy
Last updated 27 October 2026
Cookies are small files a website stores on your device. We use as few as possible, and none for advertising. Analytics cookies are only set if you accept them, and you can change your mind at any time.
Essential cookies
These make the site work and keep it secure. They cannot be switched off.
| Name | Purpose | Expires |
|---|---|---|
zc | Remembers your cookie choice | 1 year |
zf | Protects our forms against cross-site request forgery | When you close your browser |
Analytics cookies (only with your consent)
| Name | Provider | Purpose | Expires |
|---|---|---|---|
zv | Zinteli | A random visitor id, so we can tell new visitors from returning ones | 13 months |
zs | Zinteli | A random session id, linking the pages of one visit | 30 minutes of inactivity |
_ga, _ga_* | Google Analytics | Measures visits and journeys across the site | Up to 2 years |
Without analytics cookies
If you choose essential cookies only, we still count page views anonymously so we know which pages are read, but nothing is stored on your device and nothing links one page view to the next.
Other storage
Your light or dark theme choice is kept in your browser's local storage, and a draft of a form you are filling in is kept in session storage until you close the tab, so nothing you type is lost if you navigate away. Neither is sent to us until you choose to send the form.