Spam prevention and comment moderation:

To prevent spam generation computers from posting comments, we have turned on 'Spam prevention'. When you post a comment, you will be asked to type in a number of letters that are shown to you in a 'distorted' manner. Spam generating computers cannot complete this relatively simple task, and are thus prevented from posting Spam comments.

You may post any comment you wish, as per the Wikipedia model (see Wikipedia:Introduction). However, we will delete offensive or inappropriate comments.
We have the facility to turn on 'Comment moderation. This would require us to first view comments before they can be published. This would impose a time delay between you posting your comment, and it being published. We are confident that it will not be necessary to use this facility.