An act of parliament allowed D to build an oil refinery which caused offensive noise, smell and vibrations to P’s property. However HL held that since the activity was sanctioned by an act of parliament, it could not constitute a nuisance. (NB this doesn’t extend to the decisions of planning authorities- see Wheeler above).
Lord Wilberforce: The basis for this rule is that parliament has performed the exercise fo weighing up public and private interest and made a decision on that basis.