On 23 January 1922, Preston Corporation began its first bus service, running along Plungington Road using a fleet of Leyland buses.

Preston Bus launched a fleet of seven East Lancs Lolyne bodied Dennis Trident 2 low-floor buses for use on the revised 33 and 35.

[13] Both companies accused each other of unprofessional behaviour, with reports of Stagecoach drivers throwing eggs at Preston Bus vehicles.

[14] On 10 June 2008, the two companies agreed to a code of practice by the North West of England Traffic Commissioner.

On 28 May 2009, the Office of Fair Trading announced that it was referring the purchase of Preston Bus by Stagecoach to the Competition Commission.

Possible remedies included the sale of part or all of the business and measures to encourage new entry by other operators, as well as controls on fares and requirements to maintain service levels.