Australian cow and sheep farmers, winemakers, whisky drinkers and young people looking to live overseas are the big winners from a historic free trade deal with the UK, according to new details released by Prime Minister Scott Morrison.

The in-principle deal will allow farmers to ship tens of thousands of tonnes of meat to the UK tax-free every year as soon as it comes into force and remove tariffs on almost all other Australian products, the government says.

It's designed to boost a trade relationship that was already worth more than $25 billion last year, according to the UK government, and is the country's first major trade deal since Brexit.

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"Australian producers and farmers will receive a significant boost by getting greater access to the UK market," Prime Minister Scott Morrison and Trade Minister Dan Tehan said in a statement.

"Australian consumers will benefit from cheaper products, with all tariffs eliminated within five years, and tariffs on cars, whisky, and the UK's other main exports eliminated immediately.

"The UK will liberalise Australian imports with 99 per cent of Australian goods, including Australian wine and short and medium grain milled rice, entering the UK duty-free when the agreement enters into force."

The traditional young Australian pilgrimage to London will also get easier. The working holiday visa program is set to be expanded to include anyone up to 35 and give them three years to live in the motherland, instead of the current two.

Mr Morrison also promised "provisions to support mutual recognition of qualifications and greater certainty for skilled professionals entering the UK labour market".

Similar visa relaxations apply for Brits, as well as the removal of their obligation to work on a farm for 88 days, a change that has alarm bells ringing for Nationals MPs.

"The National Party has made sure that if we are to give concessions, we need to look for other mechanisms in which to make up the shortfall, and the prime minister and Liberal Party have given us that undertaking," Minister Littleproud told 9News.

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The deal eliminates tariffs on Australian wines, swimwear and confectionery, supposedly saving British households up to £34 million ($62 million) a year.

A cap remains on tax-free imports of some meats, a concession to UK producers worried about a cheaper product with different regulations flooding the market.

But it will be phased out over 15 years.

Beef imports to the UK will be taxed beyond 35,000 tonnes in the first year, rising to 110,000 tonnes in the tenth and eventually to nothing after 15 years.

The UK has imported about 33,500 tonnes of beef from Australia since 2013, according to Her Majesty's Revenue and Customs.

The caps on lamb rise from 25,000 tonnes to 75,000 over 10 years before disappearing after 15 years and sugar will be tax-free after a similar eight-year transition period.

Dairy farmers don't miss out either, gaining the ability to ship 24,000 tonnes of cheese and 20,000 tonnes of other products tax-free as soon as the deal comes into force, with limits phased out over five years.

The new agreement, the final text of which is yet to be finalised, also paves the way for the UK to enter the Trans-Pacific Partnership trade deal.

According to the UK government, Scottish drink exports to Australia, presumably mostly whisky, topped £126 million ($230 million), while the UK as a whole exported £5.4 billion ($9.9 billion) worth of services.

"Today marks a new dawn in the UK's relationship with Australia, underpinned by our shared history and common values," UK Prime Minister Boris Johnson said in a statement issued earlier in the day.

He highlighted cheaper prices for UK cars, biscuits and ceramics sold to Australia.

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Multiple recent international arrivals into New South Wales are being told to get tested and isolate as health authorities investigate a case of possible coronavirus transmission within hotel quarantine.

NSW Health on Tuesday night confirmed a returned traveller newly diagnosed with COVID-19 had an identical viral sequence to two infected travellers staying in the room next door at the Radisson Blu quarantine hotel in Sydney.

Authorities are investigating whether the third person was exposed to the virus on a June 1 flight they shared from Doha with the infected couple, on transport to the hotel, in the hotel lobby or while in quarantine.

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"Currently, there is no evidence of further transmission," NSW Health said in a statement.

"While the investigations into the transmission continue, out of an abundance of caution, all returned travellers who were on the same floor of the Radisson Blu hotel between June 1 and June 5 and were subsequently discharged are being contacted and asked to get tested and isolate at home pending further advice from NSW Health.

"NSW Health has also asked all staff who worked on the fourth floor between June 1 and June 5 to get tested and isolate pending further advice from NSW Health."

The department said genomic sequencing showed all three travellers had identical viral sequences of the Alpha variant (B.1.1.7), which was first documented in the UK.

"The couple, who were asymptomatic, tested positive to COVID-19 on a routine day-two test on 3 June," NSW Health said.

" The other returned traveller — the secondary case — returned a negative day-two test on 3 June before subsequently developing symptoms and testing positive for COVID-19 following a test on 5 June.

"The couple and the secondary case were transferred from the Radisson Blu to the special health accommodation, where they remain, following their positive tests."

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The father and daughter of the Tamil family at the centre of a national outcry over their detention on Christmas Island have landed in Perth to be reunited with the rest of their family.

Kopika and Nades Murugappan were filmed as they disembarked a small plane which landed in Perth just before 7pm.

Dad Kopika and eldest daughter Nades have been staying in Christmas Island detention, apart from mum Priya and younger daughter Tharnicaa for nine long days after the latter pair were flown to Perth so Tharnicaa could receive emergency medical care.

Immigration Minister Alex Hawke said the family of four will be permitted to live in Perth in a community detention placement while Tharnicaa continues to be treated in the city's children's hospital.

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"In making this decision I am conscious of the compassionate factors of having children in detention for prolonged periods of time versus ongoing litigation matters, matters before the courts, matters before me as minister that will take some time for us to resolve," Mr Hawke said in a press conference this afternoon.

"In doing so this will ensure that the children in the family have access to services in the community, health support, schools and other forms of support from the government and the Australian people while the final matters are being resolved."

Mr Hawke said details of the Tamil Sri Lankan family's case is still under investigation and that the government does not want to see the people-smuggling trade resume.

"They have been found at several junctures by the Administrative Appeals Tribunal, by the Federal Court, the Circuit Court, and the full Federal Court in the High Court not to be owed protection by Australia," he said.

"Their immigration status has not changed and therefore on balance I have made a decision, a compassionate decision to keep the family in the Australian community while they take further matters up with the government."

In a statement that accompanied the photos of dad and daughter boarding the plane, campaigning group Home To Bilo, which advocates for the family to return to their former home town of Biloela in Queensland, welcomed the impending reunion.

"At this stage it is unclear when Kopika and Nades will be reunited with Tharni and Priya," the group said.

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Lawyer for the family, Carina Ford, spoke just before the Immigration Minister and said Mr Hawke is still able to use his ministerial discretion.

"We would still be of the view, though, that the minister can use his power at any time. He does not need to wait until the court proceedings are finished. They are dealing with a completely separate issue," she said.

Ms Ford said the family is relieved to be reunited and to be out of Christmas Island detention.

"They would add, though, that the support they have had from the Christmas Island community has been wonderful, and they're also aware that there is this situation now that Kopica is going to have to resettle into another school.

"That's why, again, it would have been more ideal had they been sent to Bilo. But, stating that, they're looking forward to some freedom."

Priya and Nades Murugappan and their two daughters Tharnicaa and Kopika have been living in immigration detention on Christmas Island since 2019, after they were removed from their home in Biloela by Border Force officers in 2018.

Kopika and Tharnicaa were both born in Australia. Sri Lankan Tamils are considered by many to be a persecuted minority in the country.

Activists who are campaigning to return the family to Biloela, said the Immigration Minister's announcement was a welcome move.

Angela Fredericks, organiser of the group Home to Bilo, said it was for Mr Hawke and the Department of Home Affairs, not the courts, to determine the family's future in Australia.

"The Minister's power to grant visas is completely independent from the decisions of any court," Ms Fredericks said in a statement.

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"We cannot say what – or who – is preventing Minister Hawke from bringing this family home to Bilo. But it is not this court matter."

Queensland Premier Annastacia Palaszczuk said she welcomed the Federal Government's decision.

"The family of four will be allowed to settle in Perth.

"It's a long way from Biloela where their friends and neighbours have campaigned for many years for their freedom."

Mr Hawke told 2GB radio this morning that while he did not want to see children in detention, the Federal Government would likely oppose the family permanently settling in Australia.

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"Nobody wants to see children in detention … but the government's position on border protection has not changed. Anyone who arrives in Australia illegally by boat will not be resettled permanently," Mr Hawke said.

Tharnicaa is the youngest member of the family and last week was flown from Christmas Island to Perth for medical treatment.

She was diagnosed with sepsis after almost two weeks of feeling unwell, but campaigners say she developed pneumonia.

READ MORE: Coalition MPs call for Biloela family to be allowed to stay

Earlier, Treasurer Josh Frydenberg told Today the family would be reunited in Australia.

"They were pretty confronting images, as you say, of the young family and of course what we are seeking to do here with this announcement from the minister is to bring the family together," Mr Frydenberg said.

A growing group of Coalition backbenchers had been calling for an end to the saga, while others remain steadfast in the belief that granting the Murugappans residency will set a dangerous precedent.

Mr Hawke said he would consider "at a future date" whether to allow family members to apply for temporary protection, for which they had previously been rejected.

In Parliament this afternoon, Opposition Leader Anthony Albanese asked Acting Prime Minister Michael McCormack why the family were not allowed to go home to Biloela.

"These matters in relation to immigration are never easy," Mr McCormack replied.

"They are difficult. They are complicated.

"The Minister for Immigration has made a statement this morning to ensure that the support and that the health outcomes for the family will be there in Perth for them.

"We will continue to support the family."