Wilts & Dorset Motor Services Limited was incorporated in 1915, with its head office in Amesbury, Wiltshire, moving to Salisbury in 1917.

[1][4] The new Wilts & Dorset company's operating area was considerably larger than its older namesake, including Swanage, Poole, Bournemouth, Lymington, Devizes, Swindon and Salisbury, but not Basingstoke.

On 31 July 2008, a W&D open-top bus collided with two cars between Studland and the local chain ferry, injuring 30 people.

[13] A number of passengers reported the bus travelled a distance on two wheels and the eventual toppling took place at low speed.

In 2014, it was announced that the bus station on Endless Street in Salisbury would close in favour of town centre stops.

[17] In Dorset, three acquisitions were made: Damory Coaches in May 1993, Oakfield Travel in November 1993,[8] and Blandford Bus Company in January 1994.

Local residents criticised the change of route, specifically through Merley where the buses took a narrower but more direct road through the estate.

[20] From 6 April 2008, two out of the four buses per hour started to run via Corfe Mullen rather than Merley with all services also stopping at Broadstone Broadway.

As part of the 3 June 2012 network changes, the 3 was withdrawn and was merged with Route 4, which was extended beyond Broadstone to Wimborne either via Merley or Corfe Mullen.

In addition to the Citaros, ex Southern Vectis Dennis Dart MPDs were transferred and repainted into Wilts & Dorset livery with branding applied.