[Lynn Eades]

For those that don't know, The Australian Carriers and the Vickers light tank (MkVIb) had wider wheels than British and Canadian carriers.
The Wheels Colin refers to as British, are of the same style as a std. U.C. wheel, but are wider. They are the original VLT MkVIb wheels.
The track has the wider spaced horns and Australia adopted this track for its LP2 and LP2A series of carriers. (in doing so, it changed the spoke style of the wheels) This move (wider wheels/ track horns) apparently made the Australian carrier, less likely to throw its track.