It's 10.30 on a Saturday morning in October and a Porsche Macan, a Mercedes GLE and a mud-splattered Range Rover Vogue follow each other down a pine tree-lined gravel driveway. They park and the occupants emerge, sizing up their competition in the process.
Among them, a psychotherapist from Bondi; a Mosman interior decorator there on behalf of her Paddington-based daughter, and a retired couple from Newcastle. The latter might appear unassuming, but dismiss them at your peril.