I'm pretty sure that car is just a Vauxel Astra, we have them here; Holden Astra.
it isn't the Astra. This is the Astra.
The Aura is a Vectra'ized Pontiac G6 which then the Aura spun off into the new Malibu.
The Vectra is on the short wheelbase of Epsilon I. The Aura is on the long wheel base of EPI and really is not in any way related to the Vectra besides the front end.