Graham
Autumn isn't the time for planting annuals - as chillies are, just like tomatoes and lots of other common veg - try in spring !!!
In Asia its usual to see them grown through summer, the chillies are picked and hung up in long strings to dry so they have a supply for winter. They're hotter dried, too.
While in the warmer parts of Sydney they can survive through winter from to the next Spring, we find its better to rip the old plants out and start afresh with new ones planted in August.
And yes one frost will kill them.
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