Cookie policy
Last updated: July 2026
This policy explains the cookies and similar technologies used on the Best UK Windows website, what they do and how long they last. Cookies are small text files stored on your device; we also use your browser's local storage in the same way for attribution.
The cookies we set
When you first land on the site we set first-party wml_* cookies to record how you reached us, so that if you go on to make an enquiry we can attribute it to the right marketing campaign. These are set on our own domain — no third party can read them — and they contain marketing-attribution values only: UTM parameters (source, medium, campaign, term, content) and ad-platform click identifiers (for example gclid from Google or fbclid/fbc from Meta), plus the page you first landed on.
| Cookie | Purpose | Expiry |
|---|---|---|
wml_utm_source, wml_utm_medium, wml_utm_campaign, wml_utm_term, wml_utm_content | Store the campaign values from your landing URL for marketing attribution | 90 days |
wml_gclid, wml_fbc, wml_fbp and other wml_* click identifiers | Store ad-platform click IDs so a genuine enquiry can be attributed to its source | 90 days |
wml_landing_url | Records the first page you arrived on | 90 days |
The same values are also kept in your browser's local storage (keys prefixed wml_) so attribution survives you navigating around the site, leaving and returning. Where our forms rely on this, everything is best-effort — blocking storage will not stop the page working.
Tag-manager and analytics cookies
A Google Tag Manager container is included on the site but is switched off by default. If we enable it in future to run analytics or advertising tags (such as Google Analytics or Meta), those tools may set their own cookies — for example _ga and _ga_* for Google Analytics, and _fbp/_fbc for Meta. We will update this policy, and add a consent mechanism where required, before any such cookies are set.
Managing cookies
You can control or delete cookies through your browser settings, and set your browser to block them. Because our attribution cookies are first-party and contain no directly identifying information on their own, blocking them will not affect your ability to use the site or submit an enquiry — it will only mean we cannot attribute your visit to a campaign.
More information
For how we handle the personal data collected through our enquiry form, see our privacy policy. To ask us anything about cookies, please use the enquiry form on our homepage and note that your message concerns cookies.