Accuracy and currency

The material here is prepared with care, but no promise is made that it is complete, current, or free of error. What is described here can change without this page changing with it.

Linked material

No control is exercised over any website reached through a link. Their own terms and their own privacy practices apply once a visitor arrives.

If this changes

Where this needs updating, the revised notice takes effect once it is on this page.

Contact

[email protected] is the address for messages about the material published here.