Stephen Spall was jailed for 12 months in April 2018 after offences committed in 1995 while he was working for the Department of Defence.

The victims were aged about 12 at the time he targeted them, and he was 28.

The first girl was a daughter of a family friend and the second was groped at her home in Barnawartha.

Authorities moved to cancel his citizenship due to his offending.

He moved from the UK when he was eight and has spent three-quarters of his life here.

The decision was made on May 7 last year to revoke his citizenship on the grounds it wasn't in the public interest for him to remain an Australian.

Spall appealed the decision on the grounds he has family buried in Victoria, is married with adopted kids, has health problems, and has an unwell mother.

He said he was remorseful for his offending.

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"Hence why I pled [sic] guilty for my wrongful actions and served my time for them in prison," he said.

"The offending occurred during a period of extreme intoxication.

"[If] I was forced to return to the UK my life would be over."

His mother Valerie recently gave evidence in the Administrative Appeals Tribunal that she couldn't imagine her life without her son.

Spall's son said if he was sent back to the UK, it would be like his father died.

Spall said he'd lived a "clean honest life" since the offending.

Judge Frank Gucciardo said at the time of sentencing the then 52-year-old it was "utterly repugnant and abhorrent behaviour".

"There is no gainsaying that such reprehensible and vile conduct for sexual gratification perpetuated on children causes profound and longstanding trauma, often lifelong and invasive of all aspects of life so that the criminal gets on with life and even puts the events behind him while the victims are left to deal with the repercussions of such conduct for years," he said.

Senior tribunal member Damien Cremean knocked back Spall's bid to remain in the country.

"I consider the public interest is such as to demand that someone with the applicant's history of sexual misconduct with minors - despite it being now a long time ago - should not be given the privilege, as I say, of Australian citizenship," he said.

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