Maybe then you just don't meet an Arab king completely in private then?
Itís my impression the RF are often used by the government(s) for soft diplomacy, especially in the Middle-east. I would think it impossible for Charles to not forge more private ties with various royals in such a situation. I would not think him the worst at soft diplomacy actually but obviously it sets high demands on his personal integrity.
True, certainly about "soft diplomacy" but the Queen is known to meet with members of her family with Private Secretaries about if it is anything "work" related. That contrasted against Charles meeting a foreign - middle east- royal completely alone is quite telling IMO. What surprises me most is that it happened three times - once is an accident okay, thrice? Should have been better prepared IMO.
Of course it isn't the end of the world as the money went to charity but it does expose Charles for being weak IMO.