Pregnant women are to be vaccinated against whooping cough, after the biggest outbreak of the illness for two decades claimed the lives of 10 babies. Daybreak's Nick Dixon reports.
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Authorities have warned that the death toll is likely to rise as much of the building is yet to be searched.
The PM will sound out the possibility of new free trade agreements with Gulf states for once the UK has left the EU.
In the unexpected announcement on Monday, Mr Key said it was the "right time" to leave politics.