A warm room (tepidarium) was identified during excavations in advance of the CTRL HS1. The remains form part of a detached bath-house built after 160AD and added to in several phases by the first half of the 3rd century (1). This warm room is from the earliest phase. The room was a rectangular block measuring 20.0 m by 4.0 m. The external wall was 0.80 m thick with alternating courses of chalk blocks and tile, bonded with opus signinum and filled inside with a flint rubble core. A flint floor surface extended across most of the room.