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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Chris Davies MP has previously said he made an "honest mistake" in the way he submitted the claim but said he did nothing wrong.
Sir Tom Jones will not be able to perform at Emsland Arena in Germany or Belvoir Castle in Leicestershire this weekend.
Geraint Thomas has retained the leader's yellow jersey in the Tour de France.