His practice will be managed in London, Atkin Chambers said in a statement, by chief executive and director of clerking David Barnes.

Atkin Chambers is a leading set of barristers with an international reputation for providing advocacy and specialist legal advice on commercial disputes, particularly relating to construction and engineering, technology, energy and infrastructure projects.

Speaking about his new post, Mr Allsop said: “I am very pleased to be able to join Atkin Chambers in London as a door tenant and Doug Jones AO and Janet Walker CM as part of Sydney Arbitration Chambers.”

In January, Mr Allsop was appointed as a Companion of the Order of Australia in the 2023 Australia Day Honour’s List.

Mr Allsop was succeeded, as the foremost judge on the Federal Court, by newly sworn-in Chief Justice Debra Mortimer, whose appointment was announced at the end of March.

Prime Minister Albanese and Attorney-General Mark Dreyfus thanked Mr Allsop, when announcing Her Honour’s appointment, for his “dedicated service to the Federal Court and broader contribution to the Australian legal system, and [we] wish him all the very best for the future”.

Her Honour became just the fifth CJ of the Federal Court since its inception in 1976 and the first woman to assume the role.

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Earlier this week, Mortimer CJ’s swearing-in took place, with A-G Dreyfus lauding Her Honour’s appointment to the court as “another success in a distinguished and illustrious career”.

Her Honour herself commented: “When I think back to the long list of the distinguished judges I appeared before in this court and the distinguished judges with whom I’ve sat over the last 10 years, it is a mind-altering experience to be here in the middle of the bench today.”

“The judges and all staff of this court take pride in continuing to make a contribution to the administration of justice in Australia.”