Cookies can be used to store users preferences and other information about visits and actions. Cookies come in two flavours, first-party and third-party. First-party cookies are set by the site or application you are visiting and can only be read by them. Third-party cookies are set by a different web site or application than the one you are currently visiting. They are generally used to track users between different web sites and applications and to display more relevant advertising. Additional cookie information is available from our main cookies page.
The following tables explain the cookies used, what they are for and when they expire:
| Cookie Name | Domain | Duration | Category | Provider | Description |
|---|---|---|---|---|---|
| TS016beea5 | www.ordnancesurvey.co.uk | Session | Strictly necessary | F5 Networks | Used by BIG-IP ASM domain validation for security management. |
| TS016beea5028 | www.ordnancesurvey.co.uk | Session | Strictly necessary | F5 Networks | Used by BIG-IP ASM domain validation for security management. |
| BIGipServerprod_labs_http_pl | labs.os.uk | 2 hours | Strictly necessary | F5 Networks | Used by BIG-IP load balancing software to direct traffic across servers. |
| CookieControl | .os.uk | 90 days | Strictly necessary | CIVIC | Used by Cookie Control to store cookie preferences. |
| _ga_59ZBN7DVBG | .os.uk | 400 days | Performance | Used by Google Analytics to identify and track users. | |
| _ga | .os.uk | 400 days | Performance | Used by Google Analytics to identify and track users. | |
| _ga_E5T3PCFCG7 | .os.uk | 400 days | Performance | Used by Google Analytics to identify and track users. | |
| _clck | .os.uk | 365 days | Targeting/Marketing | Microsoft | Used by Clarity for synchronisation, tracking users, advertising and analytics. |
| vngage.id | .os.uk | Session | Functional | Puzzel | Used by Web Chat & Chatbot to maintain the chat session between page loads. |
| vngage.vid | .os.uk | Session | Functional | Puzzel | Used by Web Chat & Chatbot to track the current chat session. |
| vngage.lkvt | .os.uk | 90 days | Functional | Puzzel | Used by Web Chat & Chatbot to relate the current chat session to previous sessions. |
| psCurrentState | .os.uk | Session | Functional | Puzzel | Used by Web Chat & Chatbot to contain the state of current chat session. |
| _gcl_au | .os.uk | 90 days | Targeting/Marketing | Used by Google Adwords to identify and track users. | |
| _uetsid | .os.uk | 1 days | Targeting/Marketing | Microsoft | Used by Bing Ads for tracking users and advertising. |
| _uetvid | .os.uk | 390 days | Targeting/Marketing | Microsoft | Used by Bing Ads for tracking users and advertising. |
| recordID | .os.uk | 365 days | Targeting/Marketing | Dotdigital | Used by Dotdigital Customer Relationship Manager to identify, track and target users. |
| dmSessionID | .os.uk | 1 hours | Targeting/Marketing | DotMailer | Used by DotMailer to track users in email campaigns. |
| tfpsi | .os.uk | 1 hours | Targeting/Marketing | Teads | Used by Teads for measuring interaction in advertising campaigns, optimise advertisements and retargeting. |
| _clsk | .os.uk | 1 days | Targeting/Marketing | Microsoft | Used by Clarity for synchronisation, tracking users, advertising and analytics. |
| QSI_HistorySession | labs.os.uk | Session | >Targeting/Marketing | Qualtrics | This cookie is set to track the site history for analytic reasons |
| __Secure-ROLLOUT_TOKEN | .youtube.com | 180 days | Targeting/Marketing | The __Secure-ROLLOUT_TOKEN cookie is used by YouTube to manage the phased rollout of new features and updates. This cookie helps assign users to specific test groups for experimental features, such as changes to the user interface or video player. |
Last audited on: 11 June 2025