Tom Hooper wrote:
I've heard of the two styles in Aikido of Aikikai and Shodokan but what I'd like to know is what is the difference between the two styles i.e. technique.
There're a lot more than two differences. Do a search of the site, even a Google search. You'll come up with Yoshinkan, Ki, Tomiki, Iwama, Korindo, Yoseikan, Mansekan, Daito ryu, and others.
There are also numerous threads on this.