<P> Margaretta Scott appears as the aristocratic dog - owner Mrs Pumphrey . Her servant, irked at having to look after Mrs Pumphrey's pampered Pekingese Tricki - Woo, is William Hodgekin (Teddy Turner). He longs for it to "have its chips" and succumb to illness, which is why he grumbles whenever the vets pay a visit . </P> <P> In series 4, new vet Calum Buchanan (John McGlynn), based on Herriot's real - life assistant Brian Nettleton, is introduced . He and Tristan know each other from veterinary school in Edinburgh . He marries fellow Scot Deirdre McEwan (Andrea Gibb) early in series 6, and the pair emigrate to Nova Scotia . </P> <P> The Herriot children, Jimmy and Rosie, are played by several different actors in their various stints . Jimmy is portrayed by Harry Brayne in the 1983 special . Oliver Wilson takes over the role from the 1985 special until the end of series 5 . Paul Lyon plays him in the final series . Rosie, meanwhile, is played by Rebecca Smith from the 1985 special until the end of series 5 . Alison Lewis takes over for the final series . </P> <P> James' early rival for Helen's affections, the well - off Richard Edmundson, was played by Norman Mann . </P>

Who played rosie in all creatures great and small