The Dennis Dorchester was a mid-engined heavy-duty single deck coach or bus chassis built by Dennis in small numbers between 1983 and 1988.
About two thirds of the total number built were bought by Scottish Bus Group subsidiaries Western Scottish, Central Scottish and Clydeside Scottish. These consisted of 23 with Plaxton Paramount coach bodywork, and 21 with Alexander bodywork, with each of the three T-type variants represented — five each of the TS service bus and TE express semi-coach, and eleven of the TC full coach.
Leicester City Transport bought three Dorchester coaches with Plaxton Paramount bodywork, but sold them fairly quickly to Kingston-upon-Hull City Transport, which also bought one new. South Yorkshire also took on three similar vehicles.
Of the Dorchester customers in the independent sector, Geoff Amos of Northamptonshire included three high-capacity bus versions among their five examples, two with Wadham Stringer bodywork and one with Reeve Burgess bodywork, all with 71 seats. Tillingbourne Bus Company also purchased two 61-seat Wadham Stringer-bodied buses.
Other body manufacturers for the Dorchester were Duple (five, including the sole export Dorchester, for South Africa), Caetano (two coaches which made up the remainder of the Amos contingent), and Berkhof (one vehicle).