On this page you will find details of any errors in the content of this website that have been discovered since the last release, but not yet been fixed. In most cases, the errors will be addressed in the next release, and then removed from this page.
For details of important fixes in the most recent release, please see the What's new? page.
If you have spotted an error which is not listed below, I would be much obliged if you would report it using the email address at the foot of the page. Please provide as much detail as possible, and in non-trivial cases where there is a possibility of disagreement, supply as much independent evidence as you can. Thank you in advance for taking the time to help!