Terms of use

Last updated 12 August 2026

1. Acceptance

By using this site you accept these terms. If you do not accept them, do not use the site.

2. Permitted use

You may view, and print for your own reference, material published on this site. You may not republish it, sell it, or use it to train or fine-tune a machine learning model without our written permission.

3. Intellectual property

All content on this site, including text, diagrams and typographic arrangement, is owned by Sightline Press or licensed to us. The figures reproduced on this site are extracts from the manual and remain protected.

4. Availability

We aim to keep the site available but do not guarantee uninterrupted access. We may change, suspend or withdraw any part of it without notice.

5. External links

Where we link to third-party sites we do so for reference. We are not responsible for their content or their practices.

6. Acceptable behaviour

Do not attempt to gain unauthorised access, introduce malicious code, scrape at a rate that degrades service for others, or misuse the contact forms.

7. Changes

We may update these terms. The version in force is the one published here, with the date of last revision shown above.