One of a few GM brands over seas. Vauxhall is most notable for the Monaro, Vectra, and VXR8 all of which have counter parts in the U.S. and two of which were designed in Australia. Vauxhall was acquired by GM in 1925 and is among a few like Opel and Holden to offer GM cars around the world.
Just like here there are cars whose platforms, engines, and general layouts that are Vauxhall, Opel, and Holden specific. Similarly we get cars here that Vauxhall, Opel, and Holden do not, such as the Chevrolet Cobalt SS which does not have a counterpart. We do however get the Monaro in the form of the Pontiac GTO redesign, and the VXR8 is the Pontiac G8 GTP.