2Day FM hosts Mel Greig and Michael Christian were given details of the Duchess of Cambridge's condition after making a prank phone call to the hospital where she is being treated for acute morning sickness. File vision, 6 December 2012.

RADIO network Southern Cross Austereo could face a penalty of more than $50,000 if DJ Mel Greig's legal action against the organisation succeeds.

The news comes as London's Metropolitan Police Service revealed they have passed on a file to both the AFP and NSW police, urging local authorities to investigate whether charges can be laid against the Austereo DJs.

In a statement, the MPS said no charges would be laid in the UK.

"On 9 July the MPS passed a file to the Australian Federal Police and New South Wales police in relation to a hoax call made to the King Edward VII Hospital on 4 December 2012.'

"The MPS has requested that consideration is given as to whether any offences were committed under Australian legislation.''

A joint statement from the AFP and NSW Police said both jurisdictions would now investigate the matter.

"The AFP will evaluate the referral as per the AFP's usual process to determine if any Commonwealth offences are identified,'' it said.

"NSW Police will evaluate the referral to determine is any state offences are identified.''

Earlier today, advertiser.com.au exclusively reported that Adelaide-born Greig had lodged a general protections claim with the Fair Work Commission against her employer for "failing to maintain a safe workplace".

In December the radio network aired a prank call Greig and her co-host Michael Christian made to the London hospital where the Duchess of Cambridge was being treated for morning sickness.

The nurse who put through the call, Jacintha Saldanha, committed suicide days later with the incident resulting in an inquest that will take place in the UK in September.

Christian returned to the airwaves in early February - and was recently awarded Southern Cross Austereo's "top jock" award - but Greig is still in lockdown interstate awaiting a return to work.

MORE: 'Shattered' prank DJs tell their story

Her lawyer, Slater &Gordon practice group leader for commercial litigation Steven Lewis, refused to comment further on the matter, only going as far as to confirm the application had been lodged with the peak national body this week.

It is understood in the coming weeks the parties will attend a conciliation conference where they will confidentially attempt to resolve their differences.

If an outcome is not reached it could go before a federal court.

While the outcomes of a conciliation conference vary case to case possible outcomes could include changes to Greig's employment duties or work environment or a separation on agreed terms, according to Minter Ellison partner and industrial law expert Andrew Short.

MORE: Hate messages sent to royal prank host Greig's dad

"The Fair Work Commission is the industrial umpire and it will try and see if parties can reach an agreement regarding any differences they have," Mr Short said.

"The parties can agree on any terms they are happy with."

If an agreement cannot be privately reached the matter could proceed to court where if a breach of the Fair Work Act is determined, penalties are set at up to $51,000 per item and, damages can be awarded on top of this amount.

"If it went a court and penalties were imposed they could be up to $51,000 per breach," Mr Short said.

"With damages there is no cap it is whatever compensation is awarded."

This marks the third set of legal proceedings to arise from the royal prank incident. Aside from September's inquest into Ms Saldanha's death, late last month Southern Cross Austereo launched court action prevent the Australian Communications and Media Authority from ruling the radio network was in breach of its licence by recording the royal prank call.

As well as her current legal action Ms Greig in April this year announced she will appear at the September inquest in the UK.

Both Greig and Southern Cross Austereo refused to comment on the issue.

For information about suicide prevention contact Lifeline on 13 11 14, the SANE Helpline on 1800 18 SANE (7263) or Beyond Blue 1300 22 4636.

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