I decided to fit a new animatronic eye. The mutant looked good with the eyelid working butI thought a moving eye would add a bit more realism. The Mechanism is very simple, just two micro servos, one stuck on top of the other and a bracket made up which will allow the plastic ball which will become the eyeball to be attached. With the servos arranged like this I will have pan and tilt of the eyeball. It is also very compact as the whole servo mechanism fits inside the eye ball.
Once the eyeball is painted fully and set into the mutant it should look very real, well as real as a Dalek Mutant looks.