As we mark Mental Health Awareness Week and its theme of loneliness, we speak with four writers who know the importance of talking about difficult things and why conversation is at the heart of better mental health. Marian Keyes and Candice Carty-Williams share the personal stories that fed into their fiction, whilst Dr Julie Smith brings her clinical expertise to a wider audience and broadcaster Nihal Arthanayake shows how a career based on dialogue has taught him what can help us all to have better conversations.