It is a biting winter’s evening in Cambridge and apparently we are making history. This is the first serious public discussion in the UK of the law on cousin marriage, and the desirability of legislating against it, since the mid-Victorian era. At a time when British universities seem more interested in discussing diversity, equity and inclusion and decolonising the curricula than engaging with the great issues of the day, there is an unmistakable frisson as we gather around a long beechwood table in the brightly lit Weston Room of the interfaith Woolf Institute.