Set amid the vast social transition in Britain during the evolving 20th century, My Brother Jonathan is an impassioned medical drama that premiered on BritBox in 1985. This five-part series unravel the life and struggles of Jonathan Dakers, the eponymous character whose journey to achieve his aspirations frequently merges with the changing socio-political landscape of the era.

Jonathan Dakers is the older child of a simple, lower-middle-class family struggling to afford their day-to-day needs. From early on, Jonathan is shown to harbor ambitions of rising above his circumstances and making something more of his life. His younger brother, Harold, uninterested in academic pursuits, prefers to follow in their father's footsteps.

Jonathan's steady, bright-eyed determination leads him to the medical profession. He dreams of working in service of others and using his skills to fill the gap in medical care available to the working classes. However, his journey to become a fully-qualified doctor isn't devoid of obstacles or detours. The series chronicles Jonathan's struggles at a personal and professional level, a reflection of the societal liaisons that individuals of his status had to navigate in early 20th century Britain.

Jonathan falls for his childhood sweetheart, Edie Martyn, a young woman belonging to a higher-tiered social class. Their relationship encounters resistance due to the rigid class divisions that categorized the society of the time. Edie's wealthy and prestigious family proves to be the iceberg striking Jonathan's humble Titanic, steering him towards another woman, Rachel Hamer, who greatly influences the man he eventually becomes.

Insidiously seeping into Jonathan's life, World War I plays a significant role in shaping his destiny. Like many young men, his life course was drastically altered by the conflict, with Jonathan being sent to the front lines as a medical officer. His experiences during the war, including the diverse individuals he encounters and the life-and-death situations he faces, profoundly impact his perspective and values.

Back home, after the war, he faces difficulties successfully integrating into the socioeconomic spheres as a doctor. Jonathan's determination to support the underprivileged and his refusal to bow down to the prevalent class divisions incur the wrath of the medical fraternity and more affluent community members. Yet, his relentless spirit and humanitarian aspirations help him pave a new path in British medicine, defying the existing elitist medical structure.

A crucial subplot in My Brother Jonathan is the sibling rivalry between Jonathan and Harold, which evolves to highlight the class conflicts in British society at the time. While Jonathan embarks on the path to educated self-improvement, Harold chooses a route more in line with their father’s expectations, embracing humble employment and maintaining faith in the traditional social hierarchy. The differing ambitions and rivalry between the brothers serve as a mirror to the diverse paths the British society had undertaken during this transitional period.

Lasting only one season, My Brother Jonathan dives into the trials of maintaining moral integrity and the emotional toll exacted by personal and professional sacrifices in a rapidly changing world. The series is as much a portrayal of an individual's arduous journey of self-transformation as it is an intimate lens into the canvas of British society during a tumultuous era.

The series encapsulates the essence of the period, which, though dominated by rigid class structures and moral conservatism, also brimmed with rebel tendencies and challenges to existing norms. As a medical drama, it does not shy away from depicting the harsh realities of pre-NHS healthcare, further presenting its viewers with an understanding of critical historical narratives.

Performances by Daniel Day-Lewis, who plays Jonathan Dakers, and the rest of the seasoned cast, are commendable, adding depth to the complex psychological underpinnings of the characters. The narrative effectively strikes the balance between realism and drama, providing an engrossing look into the life of a common man striving to make a difference in extraordinary times.

In summary, My Brother Jonathan is not just a drama series; it's a timeless portrayal of a man's struggle against societal norms, his unbending pursuit of progress, and unwavering belief in the power of service. The series presents a stunning tableau of historical, social, and personal elements, offering its viewers a chance to appreciate how individual destinies intertwine with broader societal transitions. Whether you're a history buff, fan of medical dramas, or just someone looking for a show with depth and soul, My Brother Jonathan holds an appeal that transcends demographic barriers.