Political Editor Adrian Masters talks to two Conservative candidates at their party's conference in Llangollen. Laura Knightly will contest Alyn and Deeside in 2015 and Craig Williams is standing in Cardiff North.
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There will be a fresher feel with temperatures falling lower than on recent nights.
The accident between junction 24, Coldra, and 23A, Magor, has closed the eastbound carriageway.
Eloise Parry, 21, died after taking diet pills containing the poisonous Dinitrophenol (DNP).