 In 2004, he moved back to Sydney as a senior reporter covering business news.Mellish won a Walkley Award for business journalism in 2006 for a series of articles he wrote in November 2005, which revealed the details of former Reserve Bank of Australia board member Robert Gerard's 14-year battle with the Australian Taxation Office.Mellish revealed details of a Caribbean tax haven deal which resulted in a A$150 million out-of-court settlement for tax evasion and Gerard's resignation from the Reserve Bank of Australia.