The Health Minister, Mark Drakeford AM, says despite an increase in the numbers of people who don't smoke in cars when children are present there is still a stubborn percentage of people who still do. He says he wants to close that gap and introducing the law will make the final difference.
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The three-day event in the Welsh capital is expected to attract more than 20,000 visitors.
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The Welsh Conservatives pledged 'continued economic recovery' as they launched their manifesto in Builth Wells this afternoon.