This show switched from monochrome (black/white) to color during its run. Therefore where possible character and episode images are shown here in color even where early characters and episodes were aired in monochrome.
Also some supporting actors played more than one character over the course of the series.
Due to the 'stand alone' nature of most of the episodes and the requirements of the Board of control airing dates varied from station to staion and some were not shown until a later date.
The episode order we show is that which was intended when the show was produced but the first airing date is still specified.