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"They are everywhere, " said Shoba Raba, director of policy at the Indian branch of Basic Needs, an international mental health and development charity.
CNN: Seeking comfort from faith healers in India
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The British Schools Exploring Society (BSES), a youth development charity which had organised the expedition, has not yet decided when the pair will fly home.
BBC: Scott Bennell-Smith
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Action Aid, the development charity which campaigns for multinationals to pay fair taxes in the developing countries they operate in, said government action was key to stop companies "hiding wealth" by moving it to tax havens.
BBC: Starbucks 'paid just ?8.6m UK tax in 14 years'