Changes made by Council Decision 2012/457/CFSP of 2 August 2012 amending Decision 2010/413/CFSP concerning restrictive measures against Iran
EU Decision 2012/457
Made to Council Decision 2010/413/CFSP of 26 July 2010 concerning restrictive measures against Iran and repealing Common Position 2007/140/CFSP
From legislation.gov.uk's record of changes, the official one: see it there.