Wessex - ACU Centre/Region

The part of Somerset situated north of a line from map reference ST293520, eastwards to ST360520, southwards to ST360470, eastwards to ST480470, southwards to ST480380, eastwards to ST770380 (The Somerset/Wiltshire county boundaries) that part of Wiltshire situated north of a line east/west through Trowbridge, part of Gloucestershire situated south of a line east/west through Dursley.