I've reached the end of the line again. The only Australian coachbuilding company that I can discover that shares a name with a British company, who, as far as I can tell, wasn't a coachbuilder, is Dalgety & Co., and that really isn't two words. I guess that I will have to try again tomorrow.
Ooops I see that the puzzle has been solved while I was researching. Good work mekubb!