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"They've come around to really playing by the book, to be a good steward of processes... working with regulators to make sure what they deploy is safe."

"Jannik is a very resilient young man, and in his own mind he knows he's done absolutely nothing wrong and the process has been absolutely by the book. So I think he's very comfortable in himself," Singer told BBC Sport.

But it cannot duck the reality that, for as much as everyone involved might insist this case has been handled by the book, it has left some people feeling very uneasy.

The couple say they have "always been by the book" with their four children and had never taken any of them out of school for a holiday before last October.

“I was really trying to do everything by the book,” he said, flustered.