Thanks for the responses. I was wondering if shipping was an issue but it appears, at least here, that the P30 kits and the P3 components have the same safety related shipping limitations - domestically they both have to be surface shipped with appropriate labels. I was also wondering about the B&H pricing but haven't really decided if the P30 price is too expensive or the P3 price is too cheap. I'll keep my fingers crossed they don't read this message Neal.
I did however ask my friendly local camera store person to ask Ilford Australia about the difference and they were given the usual non-committal response. Although I think the Ilford rep may have squirmed a bit there wasn't any logic behind the price difference and I suspect they simply don't have the same markup on the P30 kits as the P3 components. Why will probably remain one of lifes mysteries.