Sam Woodhead says that he intends to continue his travels in Australia and beyond, despite his ordeal in the outback.
The teenager from Richmond is on a gap-year trip and plans to visit the Himalayas before returning home.
His mother, Claire Derry, who flew out while he was still missing, says she will take a short holiday with him in Brisbane.
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Scotland Yard said the male youths will appear in custody at Westminster Magistrates' Court on Saturday.
The family of Oliver Dearlove urged people to "think again" before using their fists, as the man who killed him began a six-year jail term.
London Fire Brigade took Southwark Council to court on four charges in relation to safety breaches at Lakanal House in Camberwell.