Liberty Steel could shut some of its dozen UK plants following the collapse of main financial backer Greensill, Business Secretary Kwasi Kwarteng said Tuesday, in a saga engulfing UK politics.

The collapse last month of British company Greensill Capital threatens thousands of jobs, including at Liberty-owned GFG Alliance -- the steel empire of Indian-British billionaire Sanjeev Gupta.

British politics has also been hit by the fallout and on Tuesday Prime Minister Boris Johnson said a review into how Greensill was able to secure UK government contracts will be given the "maximum possible access".

It comes as pressure mounts on British former prime minister and Greensill adviser David Cameron after the government on Monday announced its inquiry into his lobbying of ministers prior to the company's collapse.

On Tuesday, Kwarteng told a cross-party committee of British MPs that some parts of Liberty Steel could be lost after the government refused a bailout, a decision it has justified owing to GFG's "very opaque" structure.

"I am very keen to see that these (Liberty) assets, which are good assets, continue to operate and the company continues to operate but we can't strip Liberty Steel from the wider group under which it sits and, as Mr Gupta says, they have billions and billions of debt," Kwarteng added.

The UK government last month refused GFG a rescue package totalling £170 million ($233 million, 196 million euros).

Greensill specialised in short-term corporate loans via a complex business model that ultimately sparked its declaration of insolvency.

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