Mr Robertson also called for the Official Information Act to apply to Parliament because the best protection against the misuse of privileges was transparency. He said he had seen many things during his near three decades as an MP which would not have happened had the act applied to MPs.
As one of Parliament's longest-serving MPs, Mr Robertson said he was occasionally asked what the secret was to survival in politics.
Noting he had been "standing in another queue the day they handed out charisma" he said he had built his political career on the maxim that "all politics is local".
He had got up at 6.30am every Saturday for 27 years to go to the Otara market, before travelling to sports grounds in his electorate. "If parents, players, coaches and referees can be there every Saturday rain or shine, then so can their MP." He would then go to a bowling club in his electorate in the afternoon before attending up to three electorate functions on Saturday nights. The result was "50,000 constituents become 50,00 friends".
Sunday was "God's day" and he devoted it to his family and his church.