Wales forwards coach Robin McBryde says Wales Captain Ryan Jones has learnt from a difficult Autumn series and is leading by example.
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The coldest night of the season lies ahead, with temperatures set to plummet to lows of a possible -15c.
Some of the singers lost children in the Aberfan disaster. They perform as a way of coping with their grief and to raise money for charity.
Traffic on the M4 from Coryton to Cardiff is at a standstill following a multiple vehicle crash.