Most States in Australia are represented in London by an Agent-General.
An Agent-General is not accorded any special form of address, but his appointment should be placed after his name. For example:
John Jones, Esq
Agents-General for the States of Australia should be placed as follows:
New South Wales and Tasmania are no longer represented.
No Canadian Provinces are represented by Agents-General at the present time, although Quebec has a Government Office in London.