George,
As far as I'm aware, the 1(P) was the Brit pneumatic wheeled carriage. Those imported as such were Mk.1 (P), and those converted locally in Aust (from the pre-war stock) were Mk.1(P)(Aust). I don't know the differences in detail, but the installation of pneumatic wheels on all sorts of items in Australia used the simplest method available from locally available materials.
Mike C
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