INTERVIEWER: Who is the more emotionally vulnerable/dependent one in the relationship between John Watson and Sherlock Holmes?

GATISS: Clearly John Watson. He was a damaged war veteran drifting without purpose when he met Sherlock Holmes.

John is fiercely loyal to his friend but can be very wounded by Sherlock’s lack of feeling.

By contrast, Sherlock is a man who believes caring is not an advantage.

But slowly, slowly, John is making him more human.