Privacy

Last updated: 27 September 2026

Bradford Biology is a personal teaching site run by Adam Bradford ("Mr Bradford"). This page explains what the site does and does not collect, and what will change as new features launch. It is written to be read, not to be survived.

What the site collects today

Most of the site is just pages to read. Four things go beyond that, and all four are listed here.

Analytics. Most pages load Google Analytics, which sets cookies and reports how many people visited and which pages they read. I see totals and trends, never individuals. Google applies its own privacy policy to what it collects.

The visitor counter. The count shown on the home page measures unique visitors, and every page on the site contributes to it, not only the home page. Your IP address is hashed the moment it arrives and only the hash is kept, so the counter works without me ever holding an address. It counts people, not page views: once your browser has been counted in a given month it stops asking, so reading ten pages counts once.

Your browser’s own storage. Your theme choice, whether you dismissed the newsletter card, a marker saying the visitor counter has already counted you this month, and any answers you type into a practice paper on screen are saved by your browser on your own device. Answers to a paper you sit on screen are marked in your browser and go nowhere else: not to me, not to your teacher. (If you choose to save a marked paper to your progress, its marks are kept; see Your progress.)

Messages. If you write to me, I keep the message so I can reply. I do not add you to any list and I do not pass it on.

Embedded third parties

Some pages embed content from other services, and those services apply their own privacy policies:

• Videos page: YouTube players are embedded from youtube.com. YouTube may set cookies and collect viewing data once a player loads.
• Apps page: the study apps (Cramly, Splycr, and others) are embedded from their own sites and are governed by their own policies.

If you would rather not share data with those services, open them in a separate tab only when you choose to.

Newsletter: the teacher incubator

Signing up, on the subscribe page, at the foot of a page or in the exam maker, stores three things: your email address, the date you joined, and which page you joined from. Nothing else.

Your address is kept in two places: the site’s own copy of the list, in a database run by Upstash, and EmailOctopus, the service that sends the newsletter and handles unsubscribes. EmailOctopus emails you a link to confirm, and you receive nothing more until you click it.

Like most email services, EmailOctopus records whether an issue is opened and which links in it are clicked. I look at those as totals for each issue, never as a record of you.

Your address is used only to send the newsletter. It is never sold, and never shared beyond those two services.

The newsletter is written for teachers. Please do not sign up if you are under 16.

Every issue carries a one-click unsubscribe, which stops the emails at once. If you would also like your address deleted from both places, or to see what I hold about you, ask me and I will.

The store

Payment happens on Stripe's own page, and Stripe collects what it needs to take the payment under its own privacy policy. Card details never reach this site and I never see or store them.

When you buy a pack, this site keeps your email address, what you bought and which licence, the name stamped on the PDF (yours, or your school's for a school licence), and Stripe's reference for the payment, so a refund can be matched to it. You sign in to your library with your email and a one-time code; there is no password to keep.

AI marking

Mark my IA and the practice paper check send your report, or your typed answers, drawings and your own ticks, to Anthropic's Claude to be marked, and the result comes straight back. This site never keeps the report or your answers. It keeps your email, your credits, the marks, and the feedback itself for 90 days so you can open it again, and you can delete that sooner. For an IA it also keeps, for the same 90 days, a short list of facts the marker noted about the draft (research question, variables, trials, tests, sources; never your sentences), so the next draft can be compared with it. A paper sat on paper and marked from photographs works the same way: the photos of your pages wait in a private folder only while they are marked and are deleted the moment the marking ends; what the marker read from them is kept with the feedback for the 90 days. The paper code printed on such a paper (like P-7K3QX) stands only for the paper, its questions and their order; it holds nothing about you. The full details are on the Mark my IA page, under "Privacy, plainly".

Your progress

If you are signed in when you mark a practice paper (it saves on its own; signed out, nothing is kept unless you sign in on the paper), the site keeps, for each question you answered, which question and part it was, the marks you got out of the marks available, and whether the page, you or the AI check marked it. Never your answers. That is what your progress page reads to show which topics you have got. It is kept, against your email, until you press Delete my progress on that page, which removes all of it at once. Nobody else sees it unless you choose to share it with a teacher. Papers you sit without signing in, or without saving, still go nowhere.

Sharing with your teacher. Off unless you turn it on. On your progress page you can type the class code your teacher gave you; the page shows your teacher’s email and asks before anything is shared. Your teacher then sees, for each topic you have started, its stage (to start, learning, got it, locked in, due for review) and your score on it, your skills, your course and exam session, and when you last saved a paper. Never your answers, never your mark on a single question, and never other students’ progress unless they share it too. Press Stop sharing, Leave class or Delete my progress, and your teacher no longer sees any of it.

Coming soon: the forum

The teachers' forum is planned. When it opens, taking part will mean creating an account with a name and email address. Posts you make will be visible to other forum members. You will be able to delete your account and your posts. This page will be updated with the specifics before the forum goes live.

Your choices

You can browse the whole site, build papers and sit them on screen without giving any personal information.

If you have joined the newsletter or written to me, you can ask me to show you what I hold about you, or to delete it, and I will. Every issue of the newsletter also carries a one-click unsubscribe.

If you would rather not be counted by analytics, your browser's "do not track" or content-blocking settings will stop those scripts loading.

Changes

When the forum opens, or when anything else here changes, this page is updated and the date at the top changes with it.

Contact

Questions about privacy, or a request about your data, go via LinkedIn DM. I read every message.