article_snippet: Prince William's has made a top secret visit to Britain’s most secretive building, The Mail on Sunday can reveal.
article_snippet: Duke of Cambridge was flown from London’s Kensington Palace to Gloucestershire airport on the Queen’s helicopter Flight, funded by the taxpayer, and which is supposed to be only used for official engagements by other young Royals.
article_snippet: Under Government rules, other young Royals other young Royals have to pay for other young Royals own private visits.
article_snippet: A GCHQ spokesman said yesterday: ‘Prince William paid a private visit to GCHQ on March 19.
article_snippet: As it was a private visit we can’t go into further details of what Prince William itinerary involved.
highlights_snippet: Trip comes after  fears young royals could be targeted by hackers and spies .
  
highlights_snippet: Questions asked  about Prince William's use of a publicly funded helicopter .
  
highlights_snippet: Prince William's was flown from London’s Kensington Palace to Gloucestershire airport .