Three Coalition MPs are considering breaking ranks and voting against the Federal Government in a renewed push to establish a royal commission into the banks.

Key points: Warren Entsch and George Christensen are considering crossing the floor

Warren Entsch and George Christensen are considering crossing the floor Ann Sudmalis, frustrated by slow pace of change, is also considering her options

Ann Sudmalis, frustrated by slow pace of change, is also considering her options Acting PM Julie Bishop says Government working to address MPs' concerns

The High Court disqualification of former deputy prime minister Barnaby Joyce appears to have emboldened several Coalition MPs, who are considering crossing the floor.

Queenslander Warren Entsch told 7.30 "all hell will break loose" if his demands aren't met by the end of the month.

Mr Entsch said Treasurer Scott Morrison promised him a number of specific allegations of bad bank behaviour would be investigated but, as yet, there's been no sign of it.

He is currently in New York, seconded to the United Nations, but he will be back in time for the final sitting fortnight.

"The matters raised by Mr Entsch are still being worked on by the Treasurer and Minister for Revenue and Financial Services," a spokesperson for the Treasurer told 7.30.

Queensland LNP member George Christensen has repeatedly threatened to vote for a banking royal commission and still has concerns.

And 7.30 understands NSW south coast MP Ann Sudmalis is also considering her options, having been frustrated by the slow pace of change.

Sorry, this video has expired Julie Bishop on prospect of Coalition MPs crossing floor

Acting Prime Minister Julie Bishop told 7.30 "we want to work with those MPs and others who have constituents who are concerned about the relationship they had with their bank".

"A banking royal commission will not provide them with redress," she said.

"It would only make recommendations and that could be years away and that's why we're trying to take action now.

"I'm sure my fellow members of Parliament understand that."

'People still haven't had access to justice'

Earlier this year the Small Business Ombudsman looked into 23 cases where businesses were driven to the wall by aggressive lending practices.

It concluded a third of them could warrant "unconscionable" conduct by the banks.

"When you hear a lot of these cases, it brings tear to your eyes," Small Business Ombudsman Kate Carnell said.

"These were people that often lost a lot of money, lost houses, relationships, families, these are dramatic cases.

"They'll be putting all sorts of pressure on members of Parliament to get their day in court."

The Government has already moved to ensure small business is protected in the future with the establishment of the Australian Financial Complaints Authority (ACFA), which is expected to commence operations in July 2018.

ACFA will consider all new disputes and will have the capacity to determine cases that fall within the relevant statute of limitations period, currently six years for complaints under federal corporate law.

Any cases previously dealt with by a court won't be considered.

"What we've got at the moment is cases going forward looked after very well," Ms Carnell said.

"Banks have made changes, government have made changes, but these past cases haven't been addressed ... those people still haven't had access to justice."

Royal commission within reach, say Greens

The Greens have long called for an inquiry into the banks.

"We are within reach of passing a law through this parliament to establish the equivalent of a royal commission into the banks," Greens MP Adam Bandt said.

"Members of Government have said, the backbenchers have said, that they might even cross the floor to support it.

"So given that we came within one vote last time, and now we know Barnaby was illegally elected, we think there's every chance that the Greens bill for the equivalent of a royal commission, a commission of inquiry into the banks, could pass the parliament this November, given that it's already passed the Senate."

One source pushing for a royal commission told 7.30 that the loss of Mr Joyce means "the arse-kicking shoe is on the other foot".