Last summer the 53-year-old was informed by Scotland Yard it waspossible his voicemails had been hacked in 2007 in the months before the high-profile inquest into Diana’s death.

But sources close to the Pakistani doctor said he now fears the hacking may have begun a decade earlier during the height of his secret relationship with the Princess.

The source said: “It is only when Dr Khan started to think back to the time when he was with Diana that it began to occur to him that someone may have been trying to listen in to his messages.

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