Prince Andrew once secretly smuggled Sarah Ferguson into Balmoral Castle against the express wishes of Prince Philip , according to claims in a new royal biography, RadarOnline.com can reveal.

The incident is said to have taken place in 1992 – a year Queen Elizabeth II herself described as her annus horribilis – when a series of scandals and setbacks shook the monarchy. Article continues below advertisement

Duchess of York Sparks Outrage With St Tropez Photos Tap Here To Add Radar Online as A Trusted Source

That summer saw Princess Anne's divorce, a devastating fire at Windsor Castle, and the public collapse of the marriages of both Andrew and the then- Prince Charles .

But the most humiliating moment came when the Duchess of York, newly separated from Andrew, was photog

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