This large structure was located just 70cm below the floor within the derelict Barwicks workshop, on the eastern side of the site, to the south of Market Street. Much of the structure had been destroyed by later activity on the site, including grave cuts, large pits and 19th century foundations. The surviving features included stone and clay floors and evidence of timber walls on at least two sides. Evidence of this structures destruction by a fire was recovered in the form of burnt daub and fire debris over and around it. (location accurate to the nearest 5m based on available information)