If Andrew Mountbatten-Windsor had been a scandal-hit politician or a relegated football manager or troubled CEO he would have been sacked, replaced and forgotten years ago.

But the problem with a royal scandal is that it has no natural endpoint. And that's because you can't really be sacked from a family. They're still going to be there for births, deaths and marriages.

And behind the remarkable story of Andrew's arrest is also a personal story, two brothers, different in temperament, with different responsibilities in their family, who are now on different sides of a police investigation.

"They have our full and wholehearted support and co-operation," said King Charles about the police inquiry, after the arrest of his brother.

"Let me state clearly: the law must take its course," said the King's statement.