Christine Blower, general secretary of the National Union of Teachers (NUT), has accused Ofqual of "shifting blame" in a report which suggests pupils have been let down by the exams system.
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Other entries in the UKTV channel Gold competition included jokes about Donald Trump, Brexit, Southern Rail and Ryanair UKTV channel Gold.
Temperatures will remain close to freezing.
The prime minister's announcement came as international leaders gather in Paris on the second anniversary of the climate change plan.