The emergency department at Casualty’s Holby City Hospital has seen many heroes come and go — but few have left a mark as deep as Jan Jennings, Dylan Keogh, and Rash Masum. Each has shaped the ED in a unique way, embodying courage, compassion, and resilience in times of crisis.

As the show prepares for its historic Season 40 and a fresh start in Wales, fans are asking one timeless question: who truly was the ED’s greatest consultant?

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Jan Jennings: The Relentless Commander

While Jan is technically the paramedic operational lead, her leadership and strength have often rivalled any consultant’s authority. Tough, pragmatic, and fiercely loyal, Jan Jennings (played by Di Botcher) has carried the weight of the ambulance service on her shoulders — and often, the entire department’s morale too.

Jan isn’t afraid to make hard calls. Whether she’s commanding rescue teams in life-or-death situations or facing personal demons off duty, her courage defines her. Fans still remember her painful battles with grief, guilt, and trauma — from losing colleagues in the field to covering up a fatal incident that nearly cost her career.

But Jan’s greatest power lies in her empathy. Beneath the hard exterior is a woman who never gives up on people, no matter how broken they are. She represents the emotional backbone of Casualty: flawed, brave, and profoundly human.

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Dylan Keogh: The Reluctant Genius

Few characters capture the soul of Holby ED quite like Dylan Keogh (William Beck). A man of contradictions — coldly analytical one moment, quietly compassionate the next — Dylan has long been the department’s conscience.

His brilliance as a doctor is matched only by his discomfort with authority. Over the years, Dylan has resisted leadership titles, yet inevitably finds himself in charge when chaos hits. His dry humour, sharp intellect, and unwavering ethics make him a pillar of strength when the ED threatens to fall apart.

But it’s his humanity that truly makes Dylan beloved. Fans have watched him mentor younger doctors, support struggling colleagues, and face his own mental-health battles with humility. As the department faces change, many believe Dylan is the one constant who could keep its spirit alive.

If Casualty were to crown a “true successor” to Charlie Fairhead, Dylan Keogh would be the natural choice.

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Rash Masum: The Heart of Holby

If Jan is the strength and Dylan is the intellect, Rash Masum (Neet Mohan) is the heart. From his very first appearance, Rash stood out as the emotional compass of the show.

Over the years, he’s transformed from an uncertain junior doctor into a confident, compassionate consultant-in-training. He’s faced racism, loss, and immense self-doubt — yet every challenge has made him stronger. His recent storylines, from confronting gang violence to earning a coveted paediatrics rotation, prove that Rash’s growth is far from over.

Unlike Dylan’s cynicism or Jan’s command, Rash leads with kindness. He listens when others don’t, believes in second chances, and always puts people before protocol. As Casualty prepares for its next era in Wales, Rash could well become the show’s emotional cornerstone — a new kind of leader for a new generation.

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So… Who Wins?

Choosing the “greatest” consultant depends on what you value most in Holby’s heroes:

• Jan Jennings shows us resilience — the strength to carry on when others would collapse.

• Dylan Keogh represents integrity — the mind that keeps chaos from consuming compassion.

• Rash Masum embodies hope — the belief that even in crisis, kindness can still heal.

Each has, in their own way, defined what Casualty stands for: courage, connection, and the quiet heroism of the NHS.

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The Verdict

As Casualty moves into its 40th year and prepares to leave Holby behind, perhaps the real answer is that all three are pieces of a greater whole. The ED doesn’t run on brilliance alone — it runs on teamwork, humanity, and the bond between those who refuse to give up.

Still, one question remains for fans:
💬 Who do you think was the ED’s greatest consultant — Jan, Dylan, or Rash?