The committee were listening to evidence on their inquiry into energy policy and planning in Wales.
Brazilian authorities have also launched an inquiry into the policy.
The Iraq Inquiry is looking into UK policy on the country between 2001 and 2009.
The Policy and Resources Committee said the bus inquiry will delve into legal and accounting issues, and both will be expensive to investigate.
BBC: NEWS | Europe | Jersey | Bus contract inquiry under debate
The Environment and Sustainability Committee were listening to evidence from large energy companies on its inquiry into the energy planning and policy, on 3 November 2011.
"We (the Global Warming Policy Foundation) have now commissioned our own inquiry into the way these three inquiries have been set up and run, " he said.
This has been recognised by the Reverend John Matthews who is chairing the independent inquiry into the way the government's drug policy is being operated.
Dr Eurwyn Wiliam made the comment during he Communities, Equality and Local Government and Culture Committee's inquiry into the Welsh government's historic environment policy on 11 July 2012.
Prof Nutt is due to give evidence in June to the Home Affairs Select Committee, which is conducting a wide-ranging inquiry into the effectiveness of Britain's drugs policy including the arguments for decriminalisation.
The ICC began its inquiry after Streak and the rebel players had questioned the ZCU's selection policy.
BBC: SPORT | Cricket | Other International | Zimbabwe | Rebels angry at Zimbabwe verdict
The concession comes after the Federal Trade Commission launched an inquiry around June to determine whether Apple had violated antitrust laws with the earlier policy.
Meanwhile, sources close to Foreign Secretary Mr Hague have confirmed that he has written to cabinet ministers reminding them of government policy not to comment on the justification or otherwise for the Iraq war until after the Chilcot Inquiry reports.
By playing no role in the audit inquiry into Mr Wilby, the governors did not correctly follow the school's disciplinary policy, they said.
BBC: Isles of Scilly school head's suspension 'breached law'
The BBC's inquiry was conducted by Stephen Dando, director of BBC People and Caroline Thomson, director of Policy and Legal.
BBC: NEWS | Entertainment | BBC Hutton inquiry clears editors
The main purpose of the inquiry is to look at how successful national and local land use planning policies are in delivering government policy objectives e.g. climate change, affordable housing and regeneration.
As Peter Wallison explained in his dissent to the Financial Crisis Inquiry Commission Report, the fundamental cause of the financial crisis was U.S. government affordable housing policy, enforced by federal regulation.
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