Early on, it was recognised that the Class 150 would be unsatisfactory in some criteria for more-upmarket services, but that a derivative of the type would likely better handle these services. Thus, such DMUs were built by British Leyland at Workington (using a body construction technology derived from the Leyland National bus) between 1987 and 1988.
Early on, it was recognized that the Class 150 would not meet certain standards for higher-end services, but a derivative of the type would likely be better suited to these requirements. Consequently, DMUs were built by British Leyland at Workington (utilizing body construction technology derived from the Leyland National bus) between 1987 and 1988.