Input (grade 5): The main entrance, at the south from St. John's Hill, leads into a subway some 15 ft (4.6 m) wide which runs beneath the eastern ends of all platforms and on to a northern exit, which has restricted opening hours.
Output (grade 4): The station's main entrance is from St. John's Hill, into a foot tunnel which is 15 ft (4.6 m) wide. It runs under the eastern end of the 17 platforms, and to a northern exit, which has restricted opening hours.