Many thanks Mike, that is a first class photo. The photo I see, in a book, has the bus obscuring the ground floor. However in my photo, below the white coloured masonry and above the ground floor window arches, is a full length sign stating who they are and what they do. My photo does now show the entrance door, side street and bus park but does include a little of the building on the right. The building on the right has that white coloured fascia and part of the sign above (what may be a large window/entrance) is SERV........?
The photo in your post gives a run down appearance. The long sign I mentioned is not there, just a name over the doorway. I wonder if they have recently ceased trading or moved elsewhere? My photos states 'in around 1959', however the new coach station in Digbeth was opened I believe in 1958 so there may well have been re-developments in the area.