The document given to the BBC has scribbled notes in the margins - and Mr Flanagan, a detective constable at the time, says he wrote some of them.

I could read, take walks, scribble off letters or, best of all, do nothing at all.

“Like a confident controlled chaos,” Zack said, adding via email: “I was pretty blown away when the subject of the piece would take shape through the storm of scribble.”

The duo quietly scribbles away, creating in the presence of one another, as pages of manuscript pile up.

“Most people my age just kind of scribble,” said Johnson, 20, who works as an administrative assistant at a medical imaging clinic.