In explanation Dominic Grieve said,
...the letters contained the "particularly frank" and "most deeply held personal views and beliefs" of the prince.This sentence in itself suggests the letters contain some really damning stuff which would probably show up the monarchy in a bad light. But the real point of all this is that the heir to the throne who is unelected and unaccountable can influence democratic decision making by an elected body. This veto by Dominic Grieve makes the Government's claims to be open and democratic laughable. This decision raises a further question and that is the role of the so called champions of freedom and liberty, the Liberal Democrats? Was Nick Clegg consulted on this veto and if so what was his response?
This is a bad day for democracy, and I very much hope that the Guardian are successful in their efforts to overturn this veto in the High Court.