The Australian OOb is Australian. No NZ.
The formations were all put together with help from Dallas Gavan, who is in the Aus armed forces, and who contacted other branches to get the orgs.
And there were 51 Churchills used in the Australian army, as well as Grants and Matildas used postwar.
http://www.mheaust.com.au/Aust/Resea...hill/Chill.htm
Cheers
Andy