She was the founder of the Children's World Charity, and heavily involved in the Glastonbury Festival.
She married James Barton in August 1972 and then renowned juggler Ian 'Haggis' McLeod 16 years later.
As well as being a director of the Children's World Charity, Mrs Spencer-Churchill was Governor of the Avalon Special School.
'Grief and sadness'
Paying tribute to his late wife Mr McLeod, 44, said: "My loss is everywhere. She was to my mind one of the few people I would lay down my life for."
Michael Eavis, who runs the Glastonbury music festival spoke of his "grief and sadness" at the news of her death.
"Her energy, vitality, and great sense of morality and social responsibility have given her a place in our festival history second to none," he said in a statement.
"May her place in the great eternity be always peaceful, and perhaps the mysteries of the heavens will accommodate her spirit forever."
Mrs Spencer-Churchill leaves one son, Jake Barton, 34, from her first marriage, and one daughter Jessica, 19, from her marriage to Mr McLeod.
She died at St. Edmund's Cottages, Bove Town, Glastonbury. She is believed to have been suffering from pancreatic cancer.
She was the founder of the Children's World Charity, and heavily involved in the Glastonbury Festival.
She married James Barton in August 1972 and then renowned juggler Ian 'Haggis' McLeod 16 years later.
As well as being a director of the Children's World Charity, Mrs Spencer-Churchill was Governor of the Avalon Special School.
'Grief and sadness'
Paying tribute to his late wife Mr McLeod, 44, said: "My loss is everywhere. She was to my mind one of the few people I would lay down my life for."
Michael Eavis, who runs the Glastonbury music festival spoke of his "grief and sadness" at the news of her death.
"Her energy, vitality, and great sense of morality and social responsibility have given her a place in our festival history second to none," he said in a statement.
"May her place in the great eternity be always peaceful, and perhaps the mysteries of the heavens will accommodate her spirit forever."
Mrs Spencer-Churchill leaves one son, Jake Barton, 34, from her first marriage, and one daughter Jessica, 19, from her marriage to Mr McLeod.
She died at St. Edmund's Cottages, Bove Town, Glastonbury. She is believed to have been suffering from pancreatic cancer.
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