Import Duties Act 1932 ( 22 & 23 Geo . V c. 8 ) was an Act of United Kingdom Parliament . The Act introduced a general tariff of 10 % on most imports , though some foodstuffs , raw materials , and some imports from the British Empire were exempted . Specifically , the Dominions , India and Southern Rhodesia were exempt from these tariffs until 15 November 1932 , when the Imperial Economic Conference at Ottawa would have agreed on a system of Imperial Preference
Imperial Economic Conference
British Empire Economic Conference
Import Duties Act 1932