The hugely ambitious Parthian press project to gather in one imprint the greatest Welsh writing in English of the past 100 years has now reached 50 titles – from Raymond Williams and Margiad Evans to Rachel Trezise and Leonora Brito. Phil George leads a conversation about the scope and scale, impact and treasures of Welsh literature. What do we learn from these modern classics? What might the next 50 books be? And how might they be selected?