The series of private letters written to government ministers by Prince Charles allegedly revealing his opinions which the newspaper group claim ‘sought to alter government policies’.

Attorney General Dominic Grieve MP previously said that the letters betrayed Charles’ “most deeply held personal views and beliefs” and that they were “particularly frank”.

“This risk will arise if, through these letters, the Prince of Wales was viewed by others as disagreeing with government policy,” said Grieve.

“Any such perception would be seriously damaging to his role as future monarch because if he forfeits his position of political neutrality as heir to the throne, he cannot easily recover it when he is king.”

The letters are known by the amusing nickname ‘black spider memos’ due to the nature of the Prince’s handwriting.

Lord Judge, the Lord Chief Justice of England and Wales said the decision was “a constitutional aberration”.

Republic, an organisation campaigning for a ‘democratic alternative to the monarchy have previously stated “It is clear that Charles has something to hide – and that government ministers have colluded and conspired with him to keep it secret.”

Image: Prince Charles and David Cameron at the Delegates of the Global Investment Conference, May 2013 (Getty images)