I haven’t watched Casualty for years, found it very boring compared to a great many other medical series. I loved ER when it first started and still do, especially the earlier seasons when Mark Greene and Doug Ross were two of the main characters.
British based medical series I’ve enjoyed over the years include Bodies, Cardiac Arrest, Green Wing, This is Going to Hurt and Getting On.
There’s a brilliant (imo) German series called Berlin ER, very watchable.
There are lots of American medical series I’ve also enjoyed over the years including Chicago Hope, St.Elsewhere, Grey’s Anatomy, House, Scrubs, Nurse Jackie, The Good Doctor and Doogie Howser MD.
I remember my Mum always enjoyed Dr Kildare and Ben Casey, and she loved Dr. Finlay’s Casebook.
And going off at a tangent, I can’t forget the truly wonderful M*A*S*H.
If it’s Wednesday it’s steak and kidney pie.
