Last revised: 25 September 2026
This policy explains the cookies used on www.bigmaths.com and how you can choose which ones we use. It sits alongside our privacy policy, which explains who we are and how we look after your personal data.
What cookies are
A cookie is a small file that a website saves in your browser. Some cookies are needed for the website to work. Others help us understand how the site is used, or measure visits that come from our Facebook and Instagram posts. Similar technologies, such as scripts that send information about your visit, are covered by this policy too.
When you first visit, we ask whether you agree to statistics and marketing cookies. Until you say yes, we use only essential cookies.
Essential cookies
These are needed for the website to work, stay secure and remember your cookie choice. They do not need your consent.
| Cookie | Set by | What it does | How long |
|---|---|---|---|
PHPSESSID | Big Maths (this website) | Keeps the website working while you browse | Until you close your browser |
cmplz_banner-status, cmplz_functional, cmplz_statistics, cmplz_marketing, cmplz_preferences, cmplz_policy_id, cmplz_consented_services | Big Maths (our cookie banner, Complianz) | Remembers whether you have answered the cookie banner and what you chose | 1 year |
| Google reCAPTCHA | Google, inside our contact and waitlist forms | Protects our forms from spam and abuse | Set by Google |
Statistics cookies
We use these only if you agree. They help us improve our website and our service. We do not sell or share this data with anyone else.
| Cookie | Set by | What it does | How long |
|---|---|---|---|
_ga, and _ga_ followed by an ID (for example _ga_PT7MQH68ME) | Google Analytics (loaded through Google Tag Manager) | Counts visits and clicks, such as on “Book a Free Demo” | Up to 2 years |
_clck | Microsoft Clarity | Recognises a returning browser so visits can be grouped | 1 year |
_clsk | Microsoft Clarity | Links the pages viewed in one visit, for heatmaps and recordings of how pages are used (text typed into forms is masked) | 1 day |
Microsoft may also set its own cookies on its Clarity servers. Opt out of Google Analytics on all websites: https://tools.google.com/dlpage/gaoptout.
Marketing cookies
We use these only if you accept marketing cookies. We post about Big Maths on Facebook and Instagram, and the Meta Pixel measures how many visitors reach this website from those posts.
| Cookie | Set by | What it does | How long |
|---|---|---|---|
_fbp | Meta Pixel (Meta Platforms) | Recognises your browser so Meta can measure visits from Facebook and Instagram | Up to 3 months |
pys_*, pysTrafficSource, last_pys*, pbid | PixelYourSite (the plugin that runs the Meta Pixel) | Records how you arrived at the site, for the Meta Pixel | From the end of your visit up to 180 days |
When the Pixel runs, Meta receives information about your visit and may link it to a Facebook or Instagram account. For this, Meta and we are joint controllers. The Pixel also sends the same information to a Meta Conversions API Gateway, a server we run on Amazon Web Services in the United States, which passes it on to Meta. Meta may also set its own cookies on its own websites. Manage Meta advertising: https://www.facebook.com/adpreferences.
Change your choice
You can change or withdraw your consent at any time using the switches below. You can also reach this section from the “Cookie settings” link at the bottom of every page.
You can also block or delete cookies in your browser settings. If you block essential cookies, parts of the website may not work.
More information
For more about the providers we use, how long we keep data and your rights, see our privacy policy. Questions: email support@bigmaths.com. Andrell Education Ltd, Premier House, High Street, Crigglestone, Wakefield, WF4 3EB. ICO registration number ZA134895.