So Well Remembered (1948, John Mills, Martha Scott, Patricia Roc)

Mills steps off this bus. The 'Browdley Transport' fleetname is fake, the movie is set in the fictional town of Browdley, but was filmed in Macclesfield in Cheshire. The registration plate appears to be XS2823 or similar, which implies a Scottish origin, perhaps Western Scottish? Can anyone help with an ID?