Operating since 1st January 1963, Tweed Valley is the company's largest malting plant and is located at Berwick-upon-Tweed, Northumberland.
This has been home to Simpsons Malt since then, and is where the head office is located.
In addition to the Maltings, which produces 236,000 tonnes of malt annually, the company's central laboratory can also be found on this site.
Over 227,000 tonnes of barley are stored at Tweed Valley Maltings. The company's agricultural trading division, McCreath Simpson & Prentice, is also headquartered here.
Berwick lies between the Lammermuir Hills to the north and the Cheviots to the south, an area famous for its barley. The soils are derived from glacial drift, which gives the lightness necessary for the growth of high quality barley.
The name Berwick is derived from the early Anglo-Saxon words for Ber(e) = barley and wick = small town.