Trench XI was located on the grass seating bank to the north of the East Entrance. A complete series of deposits was excavated from Roman foundation deposits up to the older line of Little St John’s Street, moved to its present position in 1957. The significance of these results is that, for the first time, we have a complete succession of archaeological deposits showing the history of the site.
A further significant discovery was that the roadside storm drains did not empty into a linear pipe but into individual sumps. This means that in the area between the drains, where the outer wall of the Roman amphitheatre can be projected to have run, the masonry has not been removed by the insertion of pipes. Whether it had been removed at an earlier date is unknown, but it raises the possibility that a greater height of masonry survives here than has generally been believed.