Ahead of a panel with Executive Producers Steven Moffat, Sue Vertue and actor Rupert Graves at San Diego Comic Con later today, a new picture of Sherlock and John Watson has been released. The image is from the forthcoming Sherlock Special, made for BBC One by Hartswood Films, transmission date TBC. The special is expected to air sometime before the fourth series of the hit BBC One show created by Steven Moffat and Mark Gattis and starring Benedict Cumberbatch and Martin Freeman.

With thanks to BBC Media and BBC Pictures