The driver responsible for one of Australia's deadliest bus crashes has lost his bid to reduce his jail sentence over a horrific mass fatality crash.

Brett Andrew Button, 60, was handed a decades-long sentence for causing a crash that killed 10 mostly young wedding guests and injured another 25 in June 2023.

He was driving too fast and under the influence of the opioid painkiller Tramadol before his bus tipped at a roundabout in Greta in the NSW Hunter Valley.

His sentencing judge said in his half-century of involvement in the judicial system, he was unaware of any other case that had such a devastating impact on so many people.

Seven victims were from nearby Singleton - many linked to the local AFL club, including coach Nadene McBride and her daughter Kyah and Kyah's partner.

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