Regency formula: The formula a Regency romance follows. I don't read romance and don't know much about it.
Plot points: Trying not to spoil too much, the item Voldemort was seeking and the Order was trying to protect would have done Voldemort no good had he gotten it. That was the major one, there were several other minor ones which would be easier to patch up. (Voldy's explanation for why he didn't do the job himself was not credible, for instance)
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