Scope of what is published

These pages describe how something works. That is not the same as advice fitted to a reader's own position.

Links to other websites

Some links lead to websites operated by others. Their content and their handling of visitors are theirs to answer for.

Errors and omissions

The material here is prepared with care, but no promise is made that it is complete, current, or free of error. Subjects like this move, and a page can fall behind what it describes.

Keeping this current

This is not a permanent text. What this page says at the time of reading is what applies.

Getting in touch

Queries about the accuracy of something published here should go to [email protected].