Privacy Policy. When visitors leave comments on this website, we collect the data shown in the content form, and also the visitor's IP address and browser user agent string to help spam detection. An anonymised string created from your email address, also called hash, may be provided to the Gravatar service to see if you are using it. If you leave a comment, the comment and its metadata are retained indefinitely. This is so we can recognise and approve any follow-up comments automatically, instead of holding them in a moderation queue. You can request that we erase any personal data we hold about you. This does not include any data we are obliged to keep for any administrative, legal, or security purposes.