Thank you for the prompt reply.
With respect, I am unsure why positioning of a new chunk of (bulleted) text relative to the left margin, should be unduly onerous. Book styles and HTML approve the action.
While manually intensive, I was able to achieve the desired effect with
<ul style="margin:0px;padding:5px;">
I was surprised calibre just didn't handle such formatting during input conversion.
Though numbered lists didn't follow the <ol> method.