Paula Stevenson, Hayley Fullerton's mother, said she was "shocked" by the Coroner's verdict that there were "serious failures" but not "gross" failures by Birmingham Children's Hospital.
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The Duke and Duchess of Cambridge met young people who have battled mental health issues on Saturday.
Former Chancellor Lord Geoffrey Howe was Margaret Thatcher's longest-serving Cabinet minister, also taking on the role of Foreign Secretary.
Lord Geoffrey Howe is known by many for his resignation speech which was seen as the catalyst which destroyed Margaret Thatcher.