Aikido Yuishinkai

Started by Koretoshi Maruyama its chief instructor is Michael Williams Sensei, sometime resident of Australia. Not surprisingly after Aikikai Australia it is probably the largest group of Aikido dojo in Australia. Maruyama Sensei visits Australia annually and Williams Sensei often tours the Eastern seaboard. Today it numbers over 20 dojo in Australia. The national association is a registered non-profit advisory body.

See a fairly through examination and dissection of this school on the website especially the section devoted to Aikido Yuishinkai 

(Ed. note this is my school so excuse the biases). 

See also http://aikidoyuishinkai.com - The international website