Bittersweet start to the Queen's winter break: Her Majesty's arrives in Sandringham by train for Christmas - as it's announced Prince Philip is in hospital in London
The Queen is on her way to start her winter break at Sandringham | Daily Mail Online
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If there was a medical emergency, you'd expect Prince Philip (or any other member of the Royal Family staying at Sandringham) to be taken to the hospital in Kings Lynn.
It would be about an hour and a half to a 2 hour drive from Sandringham to London, so that definitely supports that it's not an emergency. I'd guess the Duke would be out in time to spend Christmas Eve with the family?