• Anyone or any theme on this list that relates to British biology or medicine: History of Biology & Medicine Timeline, including the ones we didn't cover, like John Gurdon, Dollie the sheep, ...
  
• Florence Nightingale: How much of the legend is true?
• The making of one of the Florence Nightingale movies (maybe for theatre folks?)
  
• Rosalind Franklin: What did she contribute to the Double Helix? Should she have received more credit?
• Maurice Wilkins (same questions as above)
• What did Francis Crick do after the Double Helix?
• Health and the history of sanitary sewers in London (see Bazelgette)
• The history of cholera in London
• John Hunter
• Mary Seacole (pioneer nurse at same time as Florence Nightingale)
• The development of the theory of evolution
• Social, religious implications
• What Darwin got right/wrong
  

Again, remember that you should tailor your report to your interests/major...