Terms of Service

Use of this site is on the terms below. They exist to be clear about what published guidance is and what it is not.

External Links

Links to third party sites are provided where they are useful. A link is a pointer, not a recommendation of whoever is at the other end of it.

Reuse of Content

Copyright in the material here is retained. Short extracts with a credit and a link may be used freely; copying a page wholesale may not.

Revisions to These Terms

Amendments to these terms take effect when they are published on this page. Whatever appears here when a reader visits is the operative version.

Currency of the Content

The material is prepared carefully and still cannot be warranted as complete or up to date. No guarantee is offered that every statement is correct or current: codes are amended, products are discontinued, and prices move.

Not Advice for Your Job

These guides address the typical case, never a particular property. Where what is written here conflicts with what a qualified professional says about the actual job, the professional is right.

Use at Your Own Risk

Acting on this material is done at the reader's own risk. No liability is accepted for loss or cost arising from acting on published guidance, to the fullest extent the law permits.