Merchant created the series alongside Elgin James, and it has so far followed the seven strangers from different walks of life as they are forced together and struggle to reform. In series one, a bag full of money threw them into the dark and dangerous Bristol underbelly.
It is notoriously cold—James Joyce immortalised the patch of Irish Sea as "scrotumtightening" in Ulysses—and Horgan wasn't a wild swimmer at the time, but she managed to brave a dip.
The creative jolt came, however, when she noticed a group of women somehow holding their weekly catch up in the breathtakingly cold water. "I thought, 'that's where the girls will feel safe enough to talk about their murder plans'."
