Budget day. It has its time-honoured rituals which outlive governments of all persuasions. There’s the pre-budget leaks both intentional and accidental. The Treasurer’s pre-budget photo opportunity with his family, the slightly medieval budget lock-up in which members of the media, lobby groups and the opposition are locked in separate rooms and given the budget papers several hours ahead of the budget’s delivery, on pain of death if they attempt to leave the room or, these days, attempt to tweet market-sensitive information from the bowels of Parliament House.