UPDATE: Disqus have responded to me and told me that they have now fixed the comments issue, so there should be no problem with commenting now.
Please note that our new comments policy is here.
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Some readers are experiencing issues with leaving comments on the site. it seems that the problem is with the Disqus system.
We are looking into the matter and hope to rectify it as soon as possible. In the meantime, thank you for your patience and understanding.