Think petrol prices are bad now? It's entirely possible you ain't seen nothing yet, if a worse-(but not worst)-case scenario plays out in the war in Iran.Westpac has updated its modelling on the economic impacts brought about by the conflict, particularly on energy costs.The big four bank's baseline – the scenario it thinks is most likely to play out – is the war lasts about a month, but that shipping through the Strait of Hormuz takes a further month to