It's weekly duty for the Prime Minister but only occasionally happens for the First Minister. Carwyn Jones today met the Queen for a confidential chat.
It seems likely that they discussed Brexit, not least because the First Minister was in London on his way back from a series of meetings in Brussels. And they both share a concern about anything they fear might break up the United Kingdom. But meetings with the Monarch are the one bit of Government business that remains almost completely leak-proof.