▁a ▁cas ual ▁vac ancy ▁may ▁be ▁filled ▁at ▁either ▁stat ut ory ▁half - year ly ▁meeting . ▁( b ) ▁In ▁the ▁case ▁of ▁a ▁cas ual ▁vac ancy ▁the ▁person ▁elected ▁to ▁fill ▁it ▁shall ▁ret ire ▁when ▁the ▁member ▁( s ) he ▁succeeded ▁would ▁in ▁ordinary ▁rotation ▁have ▁retired , ▁and ▁shall ▁be ▁el ig ible ▁for ▁immediate ▁re - e lection . ▁( a ) ▁When ▁necessary , ▁the ▁Con v ener ▁and ▁the ▁Vice ▁Con v ener ▁shall ▁be ▁elected ▁by ▁the ▁Business ▁Committee ▁from ▁among ▁its ▁elected ▁members ▁at ▁the ▁first ▁meeting ▁following ▁the ▁second ▁stat ut ory ▁half - year ly ▁meeting ▁of ▁the ▁General ▁Council ▁serving ▁until ▁their ▁ordinary ▁membership ▁term ▁exp ires . ▁ ▁( b ) ▁On ▁the ▁exp iry ▁of ▁their ▁ordinary ▁term , ▁the ▁Con v ener ▁and ▁the ▁Vice ▁Con v ener ▁shall ▁be ▁el ig ible ▁for ▁immediate ▁re - e lection ▁as ▁an ▁ordinary ▁member ▁of ▁the ▁committee , ▁and ▁on ▁such ▁re - e lection ▁shall ▁be ▁el ig ible ▁for ▁re - e lection ▁as ▁Con v ener ▁or ▁Vice ▁Con v ener . ▁( c ) ▁The ▁Con v ener ▁and ▁Vice ▁Con v ener ▁shall ▁be ▁ex ▁offic io ▁members ▁of ▁all ▁the ▁comm itte es ▁of ▁the ▁Council . ▁ ▁D ut ies ▁of ▁the ▁Business ▁Committee ▁The ▁duties ▁of ▁the ▁Business ▁Committee ▁are ▁to ▁trans act ▁business ▁rem itted ▁to ▁the ▁Committee ▁by ▁the ▁General ▁Council , ▁to ▁frame ▁the