7 4 , ▁a ▁special ▁annual ▁in dem n ity ▁was ▁attached ▁to ▁the ▁position ▁of ▁House ▁Le ader ▁in ▁each ▁of ▁the ▁opposition ▁parties . ▁The ▁House ▁Le ader ▁also ▁coordinates ▁the ▁Official ▁O pp osition ' s ▁floor ▁strategy , ▁often ▁with ▁the ▁House ▁Le aders ▁of ▁smaller ▁O pp osition ▁parties . ▁The ▁position ▁is ▁particularly ▁important ▁when ▁there ▁is ▁a ▁minor ity ▁government , ▁or ▁a ▁government ▁with ▁a ▁sl im ▁majority , ▁which ▁may ▁be ▁defeated ▁by ▁a ▁Non - conf idence ▁vote ▁if ▁all ▁O pp osition ▁parties ▁work ▁together . ▁ ▁Notable ▁O pp osition ▁House ▁Le aders ▁include ▁Her b ▁Gray ▁of ▁the ▁Liberal ▁Party ▁( also ▁a ▁Government ▁House ▁Le ader ) ▁and ▁Erik ▁N iel sen ▁of ▁the ▁Progress ive ▁Conserv ative ▁Party . ▁ ▁Notable ▁third ▁party ▁House ▁Le aders ▁include ▁Stanley ▁Know les ▁who ▁was ▁the ▁House ▁Le ader ▁for ▁the ▁N DP ▁from ▁ 1 9 6 2 ▁to ▁ 1 9 8 1 , ▁and ▁Bill ▁Bla ik ie ▁( 1 9 9 6 - 2 0 0 3 ). ▁ ▁List ▁of ▁Official ▁O pp osition ▁House ▁Le aders ▁ ▁List ▁of ▁Official ▁third ▁party ▁House ▁Le aders ▁ ▁New ▁Democratic ▁Party ▁Stanley ▁Know les ▁ 1 9 6 2 – 1 9 8 4 ▁Ian ▁De ans ▁ 1 9 8 4 – 1 9 8 6 ▁( act ing ▁ 1 9 8 1 - 1 9 8 4 ) ▁Nelson ▁Ri is ▁ 1 9