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BBC: Competition rules and conditions

The Producers reserve the right to cancel the competition at any stage, if deemed necessary in their opinion, and if circumstances arise outside of their control.

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If, for example, its remit covered possible failings in historic police investigations, the First Minister said it would require the Attorney General's consent, although he seemed to be optimistic that would be forthcoming if WG deemed it necessary.

BBC: History back in the headlines

"There is no intention to introduce any new charges in the short term, but if they were deemed necessary after assessing the impact of voluntary measures, they may be considered in the medium to longer term, " the document says.

BBC: New Wales carrier bag-style charges 'a possibility'

The studies warn that even if radical solutions are found to reduce emissions from this sector, governments will still need to tackle housing and transport if they are to make the cuts deemed necessary by the Intergovernmental Panel on Climate Change to have a good chance of staving off serious climate change.

BBC: Savings needed to meet future demand for resources