By Joseph Gamp An set of cast iron bollards at the end of an unassuming street in central Manchester may have been responsible for taking countless lives hundreds of years ago. The structures – standing at the east end of St John’s Passage where it meets Byrom Street – are thought to be around 200-years -old. The Grade II-listed bollards correspond to a slightly different pair at the west end of passage on Lower Byrom Street, next to St John’s Garden. But it turns out the bollards could possibly have once been used in a much more destructive capacity. In 1745, the area now known as St John’s C…