It is grouped together with Oxford Bus Company and Thames Travel, both of Oxfordshire, and with Pulham's Coaches of Gloucestershire, with the fleets of each operator regularly interchanged.

[3] In August 2003 route A40 High Wycombe to Heathrow Airport commenced, initially using second-hand Leyland Olympian double-deckers.

[5] The route, which ran in partnership with Buckinghamshire County Council and Heathrow Airport Holdings, was formally introduced in January 2004.

[6] The company launched a new commercial route in June 2004, replacing services withdrawn by Arriva The Shires between High Wycombe and Lane End.

[10] In August 2009 route 336, which had previously run between Watford and Amersham, was extended to High Wycombe reinstating a through link for the first time in 30 years.

Carousel have also started a "PickMeUp" service, operating similar to Uber and funded in part by Buckinghamshire County Council.

[19] In May 2024 Arriva proposed the closure of their Aylesbury & High Wycombe depots, with Carousel Buses saying they would take over any withdrawn services.