Downing Street said David Cameron was ready to "listen to the arguments" about a ban on smoking in cars that are carrying children.
The Prime Minister's official spokesman told a media briefing, "This is an issue that is going to be discussed and debated in Parliament today, and the Prime Minister's view is that he wants to listen to the arguments."
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First Minister Nicola Sturgeon is seeking to make a statement later today on 'the way forward for Scotland after the General Election'.
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The world's first ever 'hole in the wall' was installed in Enfield, north London, on June 27 1967.