South Wales Commercial Motors, first established in 1920, adopted its more familiar Western Welsh name in 1927 when the Great Western Railway acquired a shareholding in the growing business. In 1931, the operator's parent company was acquired by British Electric Traction, which controlled the business until all of BET's operational subsidiaries were nationalised with the formation of the National Bus Company in 1969. Based in Cardiff, Western Welsh's operations covered a substantial part of South Wales. It operated intensive services in Cardiff and the Valleys as well as more rural routes in west Wales in the counties of Pembrokeshire and Carmarthenshire. As with other BET companies, Western Welsh's fleet included a significant number of AEC and Leyland types, including such unusual designs as AEC Bridgemasters and Albion Nimbuses, all of which appeared in the company's familiar all-red livery.
Roger Davies, who now lives in Kent, though he is a native of South Wales. His career has been in the bus industry and he is a well known road transport writer and a contributor to several bus magazines.