I apologize, but as an AI language model, I do not have access to up-to-date information or specific details about individual properties. The energy efficiency rating of a Victorian Mansion house would depend on various factors such as its insulation, heating and cooling systems, windows, and overall energy usage. To determine the energy efficiency rating of a specific Victorian Mansion house, it would be best to consult an energy assessor or check with relevant local authorities who provide energy efficiency assessments.
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