The company was founded as Green Triangle Buses and then subsequently renamed South Lancs Travel before being purchased by Rotala and rebranded as Diamond North West in 2015.

This expansion took the company deeper into both Wigan and Bolton, with the most significant gain being the award of the GMPTE Easylink network of services.

Commercial work was also added, with SLT taking over route 592 (between Shakerley and Bolton) in 2002, acquiring the service from the one-man Atherton Bus Company following the retirement of the owner.

The company also added a network of services in western Wigan in 2005, when it purchased Blue Bus of Bolton's Appley Bridge outstation.

[6][7] In January 2012, Strawberry merged with South Lancs Travel and moved its operations to SLT's depot in Atherton.

[8] However, he left soon after with Strawberry being acquired by D&G and Julian Peddle and merged into the main company and the name and livery being dropped in favour of the SLT brand.

On 1 March 2015, South Lancs Travel was sold to Rotala and rebranded Diamond Bus North West.

[13][14][15] Following the commencing of Tranche 1 of the Bee Network from 24 September 2023, the garage, with its vehicles and routes, was transferred to Go North West.

Most of these are branded for Bee Network services, with fleets of Alexander Dennis Enviro200 MMCs, Mellor Orion bodied Fiat Ducato and Mellor Strata bodied Mercedes Benz Sprinter Transfer minibuses additionally purchased new for these services by Transport for Greater Manchester.