Accuracy and currency

Anything load-bearing - a number, a rule, a mechanism - is worth confirming at the primary source first. Nothing here is warranted as fit for that purpose.

Other websites

No control is exercised over any website reached through a link. From that point their terms and privacy practices are the ones in force.

Reporting an error

If you need to raise something about the accuracy of something published here, the address to use is [email protected].