Didnt realise they had old astra's and volvo's/vectra's kicking around at the docks over there. The last thing you expect to see in japan is a mk3/4(cant remember which) vauxhall astra.
I think those car will have been shipped over there to design projects with them, like carbon bonnets, lambo doors or even brake pads and a like. They obviously don`t have many european cars over there.