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Proceeds from next month s virtual concert will help vital research into the lung condition.
Alice died while waiting for multiple transplants, just four months after the release of her debut album Daydreams and years before wonder CF drugs like Kaftrio existed.
Call The Midwife star Jenny, 67, has a niece Rachel McGrath, 42, who suffers from CF and started taking Kaftrio a year ago.
Jenny said: It s a wonderful event for the Cystic Fibrosis Trust, who have been hit hard by Covid-19. This Christmas we can all make sure Covid doesn t stop them helping people and we can get into the Christmas spirit at the same time.