Privacy

This explains what personal data Superadditivity collects through this website, why, and what you can do about it. Superadditivity (Sue Johnson) is the data controller. For any question or request, email sue@superadditivity.com.

What we collect and why

• Enquiries. When you use the contact form we collect your name and email, plus anything else you add (phone, company, message), so we can reply. We also log the time and your IP address as a basic spam check.
• Newsletter. If you subscribe we collect your email so we can send the occasional update. Unsubscribe any time by emailing us.
• Analytics. If you accept the cookie banner we use Google Analytics 4, with IP anonymisation, to see which pages are read and where visitors come from. Nothing runs until you accept. See our Cookies page.

Our lawful basis is legitimate interest for replying to enquiries and running the site, and your consent for the newsletter and analytics.

Who handles it

We do not sell your data or share it for marketing. It passes through a few providers who run the service for us: Microsoft 365 delivers and stores enquiry and newsletter emails, Google Analytics measures the site once you consent, and Fasthosts hosts it in the UK. The site is built and maintained for us by Vu Agency.

How long we keep it

We keep enquiry emails as long as we need them to deal with you and for our records, and newsletter details until you unsubscribe. Ask us to delete anything sooner and we will.

Your rights

You can ask to see, correct, or delete your data, or to stop us using it, by emailing sue@superadditivity.com. If you think we have mishandled it, you can complain to the Information Commissioner's Office at ico.org.uk.

Last updated June 2026.