Dr George Findlay, Cardiff and Vale University Health Board's Clinical Board Director for Children and Women, told ITV News that between six and 12 inches of water had flooded the top two floors of the Children's Hospital for Wales - and some ceiling tiles had come down with the force of the water.
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The Prince of Wales and Duchess of Cornwall's summer tour continues as His Royal Highness officially opens a new Baking Academy in Wrexham.
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A report commissioned by the Alzheimer's Society estimates that in 2013, the total cost of dementia in Wales was £1.4 billion.