It took me ages to find decent T bags and I like the Twinings English breakfast tea, a bit pricy but nice and Tetley english blend arent too bad. Watch out for the items in Coles they are really expensive but good if you need a fix.
Chocolate is another matter, I go to the Sweet shop at Christie beach, Hallet Cove or Glenelg. ( I need to go as my husband ate my last Double Decker!!!!) My friend in the Uk actually bans me from sending her Cadburys chocolate from here!!!
Butter: they have Lurpax here or try Western star.
Hope that helps