They include Meimanat Hosseini-Chavoshi, an Iranian-Australian population expert who was detained late a year ago while visiting Iran on a study tour.
Whereas there don't appear to be any proper figures on the sequence of detainees with British hyperlinks being held in Iran, these are no longer decrease than about a of those who're understood to be incarcerated as segment of Iran's "hostage diplomacy".
According to The Times, one of the British-Australian citizens is a blogger who was documenting her travels on social media with her boyfriend, when they were both detained 10 weeks ago.
The Australian Office of International Affairs and Trade did not promptly to answer to requests for comment.
The Australian government has confirmed that three of its citizens have been detained in Iran following media reports that a couple were apprehended in a military area, and a female academic was jailed in a separate incident. It's the same prison where a British-Iranian aid worker, Nazanin Zaghari-Ratcliffe, has been jailed since 2016 on spying charges, The Times said.
"The pattern of arresting foreign nationals in Iran is becoming increasingly alarming".
The two British-Australian ladies were reportedly jailed in the infamous Evin Prison, in the capital Tehran.
"The Department of Foreign Affairs and Trade is providing consular assistance to the families of three Australians detained in Iran", news agency AFP reported quoting a spokesperson.
While the charges against her also remain unclear, 10-year terms are routinely given in Iran for spying charges, the paper reported.
The Australian government's official travel advice for Iran overall is for people to reconsider the need to travel to Iran "due to the risk that foreigners, including Australians, could be arbitrarily detained or arrested".
"All Australian citizens and holders of dual nationality with Australia who are travelling to or through Iran are urged to follow the travel advice on the DFAT Smartraveller website".
Britain later released the Iranian tanker it was holding. "Dual nationals are also at risk".
It was unclear when or why the lecturer was arrested, the Times said.
Relations between the United Kingdom and Iran took a plunge in recent months by a row over the seizure of oil tankers.
Last month, Australia's Prime Minister Scott Morrison announced the country's defense force would work alongside the U.S. and the United Kingdom on a maritime security mission in the Strait of Hormuz.