Ten per cent (5.8 million) of people provided unpaid care for someone with an illness of disability.
Over a third (37 per cent, 2.1 million) of those people were giving 20 or more hours care a week.
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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.