Father of 5-year-old with cystic fibrosis says new treatment is a 'game-changer'
Five-year-old Ayda Loudon is one of around 10,000 people in the UK living with the life-limiting lung condition
Ayda Louden
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Ayda, 4, starts life-prolonging cystic fibrosis drug
Her family says it was the best Christmas present they could receive.