Hi Oliver
Welcome to Poms in Oz.
I would expect that the visa sticker can be put into your passport in the UK. What does the Grant letter say? Were you asked where you wanted the visa to be "evdenced" - ie the label put in to your passport? Please see the link below and click on the Visa Evidencing section.
Visas and migration - Australian High Commission
If you want to go to Oz House in person, you may, but there is no system of appointments. It is 'first come, first served' and the queue can be lengthy. I reckon itis just as easy to do it by post because if you send your passport off on Monday, you will have it back on Friday or at the very latest Saturday.
However, DO use Special Deliveriy both ways. A "silver pouch" is provided for the return delivery and you sed that with your passport & grant letter, and the silver pouch is addressed to you. If you want to track the return of the silver pouch, you must get the tracking number from it and make a note before you seal it ito the despatch envelope.
The Brain of Britain in my local Post Office told me, "You don't need the tracking number for the silver pouch because the sender will track it." Sweeping statement, that, because DIAC make it abundantly cleer that they will NOT track it themselves.
Penny a minute is genuine, good and does not need a card. Please see here:
http://www.pomsinoz.com/forum/news-g...-calls-oz.html
I don't know the answer to your third question, but I'm sure someone else will. Meanwhile, I would suggest a look at
Australian Taxation Office Homepage because you might find the answer on there.
Cheers
Gill