Privacy Policy

Last updated: 2026-04-19

This policy describes how Tredecology Ltd(“we”, “us”) collects, uses, and protects your personal data when you visit tradecalculator.co.uk. It is written to comply with the UK General Data Protection Regulation (UK GDPR), the Data Protection Act 2018, and the Privacy and Electronic Communications Regulations (PECR).

1. Data controller

The data controller is Tredecology Ltd.

Contact for data-protection matters: admin@tredecology.co.uk.

2. What we collect

We collect only the minimum data needed to run and improve the site.

2.1 Data you provide

Calculator inputs.Numbers and selections you type into calculator forms are processed in your browser. They are never sent to our servers. They are stored in your device’s localStorageonly if you opt in (see §3).
Enquiries. If you email us, we retain your email and the message you send, solely to answer you.

2.2 Data collected automatically

Google Analytics 4 (GA4).Measures aggregate usage (page-views, click events, country, device). GA4 uses cookies and sets a pseudonymous client ID. We use it only after you grant consent through our cookie banner. Google is a joint processor; see Google’s privacy policy.
Microsoft Clarity.Records anonymised session replays and heatmaps to help us improve usability. Loaded only after you grant consent. Microsoft is a joint processor; see Microsoft’s privacy statement.
Server logs. Cloudflare Pages (our host) may retain short-lived access logs for security and abuse prevention. These are not used for user profiling.

3. Local storage on your device

Some calculators can remember preferences on your own device for convenience:

Calculation history.If you run a calculator, the calculator name, a short result summary, and the page URL are saved in your browser’s localStorage so you can revisit it. Up to 100 entries are kept, newest first. Nothing is sent to our servers.
Unit preferences. If you switch between mm/m or kg/lbs on a calculator, the choice is remembered on your device.
Cookie-consent preference. Your accept/reject choice on the cookie banner is recorded so we do not ask again on every visit.

You can clear any of this at any time: browser Settings → Privacy → Clear site data, or the “Clear history” button on the calculator page.

4. Legal basis for processing

Consent(UK GDPR Art. 6(1)(a) + PECR reg. 6) for analytics cookies and session replay. You may withdraw consent at any time — clear your browser cookies for this domain.
Legitimate interest (UK GDPR Art. 6(1)(f)) for server security logs and abuse prevention.
Performance of a contract (UK GDPR Art. 6(1)(b)) for responding to enquiries you send us.

5. Who we share data with

Personal data is shared only with the joint processors named in §2.2 (Google, Microsoft, Cloudflare). We do not sell personal data. We do not use personal data for advertising-targeting.

6. International transfers

Google, Microsoft, and Cloudflare may process data in the USA and other countries under Standard Contractual Clauses or equivalent UK safeguards (UK GDPR Chapter V).

7. Retention

GA4 aggregated data: up to 14 months (Google default).
Clarity session data: up to 13 months (Microsoft default).
Your localStorage: kept on your device until you clear it.
Enquiry emails: up to 24 months after last correspondence.

8. Your rights

Under UK GDPR you have the right to:

access the personal data we hold about you (Art. 15);
rectify inaccurate personal data (Art. 16);
have personal data erased (Art. 17);
restrict processing (Art. 18);
port your data to another provider (Art. 20);
object to processing based on legitimate interests (Art. 21);
withdraw consent at any time without detriment;
complain to the Information Commissioner’s Office (ICO).

To exercise any right, email admin@tredecology.co.uk. We respond within one calendar month (Art. 12(3)).

9. Security

The site is served over HTTPS from Cloudflare with standard security headers (CSP, HSTS, X-Content-Type-Options, Referrer-Policy, Permissions-Policy). Because calculations run in your browser, calculator inputs never traverse our servers and are not at risk of transit interception.

10. Changes to this policy

We update this policy when the law, our processors, or our practices change. The “last updated” date above reflects the most recent revision.