As good a starting point as any is R(H) 3/05. www.administrativeappeals.tribunals.gov.uk/aspx/view.aspx?id=1475
In summary, the "inference" approach is typically taken where evidence / information is not provided, or is incomplete, or is unavailable. However, any inference that is drawn must (normally) be with regard to any relevant evidence / information that is already available.
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