McGill's Buses runs local and express services across Renfrewshire, East Renfrewshire, Glasgow, Paisley, Braehead, and into Inverclyde destinations like Greenock, Wemyss Bay, and Largs. Routes connect shopping centres such as Piazza and Buchanan Galleries, plus attractions including Paisley Abbey and Glasgow Science Centre. The operator has reached 20 million zero-emission miles through a £95 million investment in electric buses. Independent research named it the UK's top bus operator with 97% customer satisfaction.