Final answer:
In 'A Tale of Two Cities', Darnay's profession in England is that of a French tutor, which is a significant part of his character's narrative arc.
Step-by-step explanation:
Darnay's profession in England is a tutor. Charles Darnay is a central character in Charles Dickens' novel 'A Tale of Two Cities', who leaves behind his aristocratic background in France for a more humble existence in England. There he works as a French tutor, teaching language and literature to English students. This role not only allows him to earn a living but also serves as a way for Darnay to distance himself from the oppressive aristocracy he once belonged to in France.