LazyGun - "If it was a private communication in a personal capacity, or even just letters requesting some clarifications or information then you might be right, alba -but if it is a missive in his official capacity as PoW, using his position of influence to lobby for the spending of public money on a particular hobby horse of his in effective secrecy, then the public have every right to know IMO."
I entirely agree.
Failure to publish on these grounds -
'But Mr Grieve exercised his right to a veto, arguing that the letter would damage Charles's 'role as future monarch' because they show him 'disagreeing with Government policy'.
infers that the letters would reveal either an improper level of influence on the government, or that Charles's views are so left-field that the populace might question his sanilty.
But neither of those are justifiable reasons for withloding the letters - if the POW seeks to use influence via his position, then that is inappropriate, and the nation should be made aware. If they are simply private letters expressing a viewpoint, then what does the POW have to fear from publication?
A cover-up is still a cover-up - whatever mealy-mouthed excuse is used to facilitate it.