Greensill Capital collapsed earlier this year, dragging its senior adviser and former Prime Minister David Cameron into the heart of a lobbying row.
The Government has now launched an independent review into Greensill Capital after questions mounted over Mr Cameron's efforts to secure access for the finance company.
The firm filed for insolvency protection in March - news that put thousands of UK steelmaking jobs at risk.
Here, BusinessLive and PA news agency look at how the controversy unfolded - and what happens next.
What is the Greensill row all about?
Labour has led calls for an inquiry after it emerged that Mr Cameron had privately lobbied ministers, including Chancellor Rishi Sunak, to win access to an emergency coronavirus loan scheme for his employer, Lex Greensill.
Allegations also surfaced that Mr Greensill, an Australian financier, was given privileged access to Whitehall departments when Mr Cameron was in No 10.
What is Greensill Capital?
Finance firm Greensill Capital was founded in 2011 by Alliance Manchester Business School alumnus and billionaire financier Lex Greensill. It focussed on the provision of supply chain financing and related services.
It had offices across the world, and its three UK locations were in London, Daresbury Business Park and Warrington.
What was David Cameron's involvement?
Mr Cameron, who became an advisor to the firm in 2018, sent a number of texts to Mr Sunak's private phone asking for support for Greensill, which later collapsed into administration, through the Government's Covid Corporate Financing Facility (CCFF).
It was later reported that Mr Cameron had arranged a "private drink" between Health Secretary Matt Hancock and Mr Greensill to discuss a payment scheme later rolled out in the NHS.
The former Conservative leader also emailed a senior Downing Street adviser, pressing for a rethink on Mr Greensill's application for access to emergency funding.
Are jobs on the line?
Greensill was the main financial backer of Liberty Steel and its collapse has left the firm, which employs around 5,000 workers at a number of sites across the UK, facing an uncertain future.
What has Mr Cameron said about the row?
Breaking his weeks of silence in a statement on Sunday evening, Mr Cameron insisted that, in his representations to Government, he did not break any codes of conduct or lobbying rules.
But he did acknowledge that he should have communicated with the Government "through only the most formal of channels", rather than texts to Mr Sunak, and said he accepts there are "important lessons to be learnt".
Mr Cameron said "many of the allegations" made in recent weeks "are not correct" as he challenged what he called a "false impression" that Mr Greensill was a key member of his team while prime minister.
Hasn't a watchdog already looked into this?
Last month, the Registrar of Consultant Lobbyists cleared Mr Cameron of breaking lobbying rules, because, as an employee of Greensill, he was not required to declare himself on the register.
What will the independent review involve?
The review, commissioned by the Cabinet Office on behalf of Prime Minister Boris Johnson, will examine how Government contracts were secured by the company and the actions of former premier Mr Cameron.
Who is leading the review?
Nigel Boardman, who is a non-executive board member of the Department for Business, Energy and Industrial Strategy and chairman of the Audit and Risk Assurance Committee.
The lawyer has previously conducted a review of Cabinet Office procurement processes, according to Downing Street.
