This fourth book in this series covers all of Wales and English counties of Derbyshire, Nottinghamshire, Leicestershire, Warwickshire, Staffordshire and Worcestershire. It provides a snapshot of the great variety of buses operated in these areas at the start of the 1970s. The operators featured include the remaining municipal operators in the region, the subsidiaries of the NBC and the newly formed West Midlands PTE, the only PTE, courtesy of its take-over of Walsall, to operator trolley buses.