Somewhat inevitably given the money at stake, Warner are thought to be toying with the idea of presenting the film in 3D. Although there has been no firm announcement either way, (which would suggest that if it is present, it will be added in when shooting has finished) it’s an idea that Kieran Mulroney for one is open to.

“The wind keeps moving in that direction,” said Mulroney of 3D filmmaking in general. “Sherlock would be great in 3D.” It would certainly lend itself to the pounding action sequences of the first film, which Mulroney asserts are true to the origins of the character. “From all the stories, he was a brawler and he had martial arts training,” says the writer. “He didn't smoke a curvy pipe!”

Well, pipe or no pipe, Sherlock himself is another who can see the potential of a three-dimensional spruce-up, with Downey Junior suggesting the studio would be foolish not to consider it.

“Certainly, if you don't (consider it), then you don't have that option,” said the star to MTV. “If the last six months have shown anything, it's that audiences like options, and they will take advantage of them. And you're leaving a bunch of dough on the table if you don't shoot something in 3D.”

We really wouldn’t be surprised to see it happen to be honest. As Downey so eloquently points out, if there’s one thing that studios hate, it’s leaving dough on the table...