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I was driving back from Portsmouth when I heard it on the car radio. I had spent the day on the Isle of Wight and had noticed the Union Flag at half mast on Carisbroke Castle, but assumed it was probably the Queen Mother or some other aged member of the royal Family.
The opening line on the radio was something like,"Prince Charles is flying to Paris to bring back the body of Diana . . . " which came as a great shock to me at the time, not even being aware of her demise.