Driving away from Cardiff Prison on the romantically-named Central Link road towards Cardiff Bay, beloved of tourists and politicians, you’d be forgiven for failing to notice a short-lived part of Cardiff’s history, as it is no longer there. As one accelerates away from the jail, as men of goodwill are wont to do – despite the saints rushing in the opposite direction to visit the prisoners – it will take you mere seconds to pass above what used to be a Catholic enclave of 200 houses right in the heart of the Welsh capital.