Frederick North , 2nd Earl of Guilford , KG , PC ( 13 April 1732 â `` 5 August 1792 ) , more often known by his courtesy title , Lord North , was Prime Minister of Great Britain from 1770 to 1782 . Frederick North , 2nd Earl of Guilford , KG , PC ( 13 April 1732 â `` 5 August 1792 ) , more often known by his courtesy title , Lord North , which he used from 1752 until 1790 , was Prime Minister of Great Britain from 1770 to 1782 .