[1][2] Designed as a premium underfloor mid-engine coach chassis, it was unveiled at the 1982 Motor Show.
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.
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.
[6] 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).