It is a rumour in the pub milieu that PC is a tit man. Hence his obsession with Camilla overcoming his duty to Diana and the State.
One has no choice in these things he might say in his defence. And with no objection from me.
But I don't think freemasonry encourages such a thing judging from those I have known who subscribe to the craft. They were, to a man, dick men. They scored. They worshipped themselves too much to have any inclination to worship anything else least of all a pair of pendulous and generous norkie fun-bags.
So if he is the leader of the freemasons I guess it is a fixed aspect of his fate as the first born son of H.M. Our Gracious Queen, who is not at all lacking in the tit department Herself. It might not mean he subscribes to the doctrines of free masons. He might simply go through the minimal motions for the sake of peace and quiet and because he is so very polite and civilised. And maybe some small contracts.