Charlie is being careful as to how far he should go in dealing with Andrew.
There is a possibility if Andrew is completely buried questions may be asked his own behaviour
Very likely, @Whatacircus, and with good reason
There's a lot said about Andrew visiting the middle east, but even a brief glance at a list of Charles's foreign visits shows there's hardly been a year since 1999 when he's not done the same - though interestingly it was as if he'd hardly heard of the area prior to then
Of course these nations have a lot of money to spend and doubtless it'll be said that they support his charities, but I wouldn't want to assume that this is where it stops - and especially not when his henchman was caught flogging citizenship and honours, which predictably Charles denied knowing anything about