The shopworkers' union Usdaw received boos at the TUC conference when it announced that it was opposed to the motion looking into a General Strike.
But Usdaw said the action would hand the Government "the biggest stick to beat us with".
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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.