Sherlock co-creator Mark Gatiss has revealed that they are close to agreeing on a date to begin filming the fourth season of the detective drama.

Speaking to Digital Spy Gatiss said, "I can officially tell you that we are moving closer to agreeing some dates to shoot. If that sounds like a party line, it is.

"That is proper progress because Ben [Benedict Cumberbatch] and Martin [Freeman] and Stephen [Moffat, Sherlock co-creator] are so busy, but actually trying to get everybody to interlock is – we have made significant progress."