What cookies are

A cookie is a small file a website asks your browser to store, so that it can recognise your browser on a later visit. Related technologies — local storage, pixels, device fingerprinting — do a similar job by different means, and this policy covers those too.

What this site uses

At present:

• We run no analytics.
• We use one advertising tool, the Meta Pixel, and only if you accept it on the cookie banner.
• We keep your answer to the banner in your browser, and nothing else.

Your cookie choice

On your first visit a banner asks whether you accept advertising cookies. Accept and Reject are equally easy, and the site works the same either way. Your answer and the date you gave it are kept in your browser's local storage under the name tum-cookie-consent, so that you are not asked on every page. It is not sent to us or to anyone else, and it stays until you change it or clear this site's data in your browser.

The Meta Pixel (only if you accept)

We advertise on Facebook and Instagram. The Meta Pixel, from Meta Platforms (the company behind Facebook and Instagram), tells us whether those adverts lead people to book a free diagnostic, and helps Meta show our adverts to people more likely to find them useful. Until you press Accept, nothing from Meta loads. If you do accept:

• your browser loads Meta's code from connect.facebook.net;
• Meta's code sets a cookie on this site called _fbp, which identifies your browser to Meta and lasts 90 days. If you arrived by clicking one of our adverts, it also sets _fbc, which records that click and also lasts 90 days;
• your browser tells Meta, at facebook.com, which pages of this site you view, and when you use the WhatsApp or email link to book a diagnostic or contact us. These requests carry your IP address, your browser's details and, where your browser allows it, cookies Meta has already set in your browser, which can let Meta connect your visit to a Facebook or Instagram account you are logged in to.

We do not send Meta your name, email address, phone number or anything you write to us. Meta uses what it receives under its own Privacy Policy and Cookies Policy, including to measure and improve its advertising.

Third-party requests

Apart from the Meta Pixel above, two things on this site cause your browser to contact another company. Neither sets a cookie, but both mean that company receives your IP address and basic request information:

Google Fonts

The Merriweather typeface is loaded from fonts.googleapis.com and fonts.gstatic.com. Google states that it does not set cookies for font requests, but the request itself is logged. Self-hosting the font files removes this entirely, and is worth doing.

WhatsApp

The WhatsApp button is a plain link. Nothing loads from WhatsApp until you click it, at which point you leave this site and WhatsApp's own terms and privacy policy apply.

Managing cookies

You can change your answer at any time with Cookie settings at the foot of every page. If you withdraw consent, the Meta Pixel stops sending anything at once, and we delete the _fbp and _fbc cookies from this site. Cookies Meta keeps on its own sites are managed in your Facebook or Instagram settings, or in your browser.

You can also block or delete cookies in your browser's settings. Nothing on this site depends on them, so blocking them will not stop anything here from working.

Changes to this policy

If we add anything that sets a cookie, we will update this page before it goes live. If a change affects what you agreed to, the banner will ask you again.