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The Duke and Duchess of Edinburgh were among those who attended a service at Westminster Abbey to mark the 75th anniversary of the UK's National Health Service. At three-quarters of a century old the NHS is facing multiple pressures. There is a record rise in demand for care, a record 7.4 million people in England are on waiting lists, and NHS Providers say the health service is experiencing “the biggest financial squeeze in its history.” The big question is, what does the next 75 years hold for this beloved but battered British institution?