Method Not Implemented GET to wp-admin/post.php not supported

Other solutions to this usually revolve around the mod_security Apache module. However this was very specific to the one post. In the end I tracked it down to this fragment of HTML:

CD.</li>

If I chopped it down to just this:
CD.<
it would work, but adding that / made it fail.

I don’t have ready access to the security rules that are set up on this hosting, though I could ask them. My theory is though that this fragment of HTML looks like a malicious script and is triggering some rule. To get round it I changed CD to C.D.

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