Why did carol drinkwater stop as wife to James Herriot - there was another person that played Helen Herriot?

Carol Drinkwater stopped playing the role of Helen Herriot in the television adaptation of James Herriot's stories due to a combination of factors, including a desire to pursue other acting opportunities and creative differences. After the first series, she was replaced by actress Lynda Bellingham, who took on the role for the subsequent seasons. Drinkwater's departure allowed for a fresh interpretation of the character, aligning with the evolving narrative of the series.