Hi Alistair
If the tool is indeed Australian, the only manufacturer I can think of is a company called Arbortech. It is a local ( Western Australian ) company that has invented a number of interesting machines, mainly for woodwork but other things as well.
The machine that most closely fits your description is the Mini carver ( updated from the one previously sold as the Mini grinder ).
You can check the Arbortech website for their product range and they also list a number of UK distributors.
They don't seem to have a fitting for the Quick-lock system but do have a 50 mm rubber backed disc system for sanding and polishing.
The only other possibility, and going down in size a little, is the Proxxon long nosed angle grinder.
From memory both of these are mains voltage machines so the transformer leaves me wondering a little.
Best of luck with the search,
Pero