Another comment.

Looking at Great Britain -> Australia, you say ::

... 00 + 61 + area code + phone number

There are only 7 such area codes. These correspond to an Australian State. Probably it would be worth listing some _example_ phone numbers in each State, with a label to each State. Often I have a local person give the phone number in an email, presuming I'm in the same State.

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e.g

Victoria :: 00 + 61 + 3 + 9651 8911 (Vic Parliament)

New South Wales :: 00 + 61 + 2 + 9230 2111 (NSW parliament)