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Diamond Bus is a bus operator in the West Midlands . It is a subsidiary of Rotala .
In 1984 Geoff Howle commenced a coach operation trading as the Birmingham Coach Company. Following deregulation of the bus industry in 1986, Howle applied to operate route 16 between Hamstead and Birmingham in competition with West Midlands Travel .
In 2000 Birmingham Coach Company was re-branded as Diamond Bus, replacing many of their existing Leyland Nationals , expanding their network in Birmingham and the Black Country. By 2003 Diamond Bus had become a National Express contractor and opened a depot in Bradford .