Den Watts

Den Watts was a fictional character who appeared in the British soap opera EastEnders. In 2007, with the popular ghost phenomenon, a storyline featured Den coming "back from the grave". He confronted Peggy Mitchell, who told him to get out of her pub, saying that the only spirits she served were gin, whisky and vodka.

It turned out the ghost who played Den, along with the rest of its kind, was a Cyberman from another universe that had come to invade Earth. (TV: Army of Ghosts)

According to one account, Gustave Lytton encountered Den Watts in the pub and mistook him for Kiston. (PROSE: Mistaken Identity)

Behind the scenes
Lytton confusing Den for Kiston in Mistaken Identity is a joke. Den Watts was played by Leslie Grantham, who also played Kiston in Resurrection of the Daleks.