Article continues below advertisementPrince William is said to have been left "horrified and sickened" by Sarah Ferguson's insistence Queen Elizabeth II's ghost has communicated with her from beyond the grave through her corgis - with insiders telling OK! the remark "crossed a line" at a sensitive moment for the monarchy.The 43-year-old Prince of Wales is understood to have privately reacted furiously after 66-year-old former Duchess of York Ferguson made the comments during a public appearance at the Creative Woman Platform Forum.