Interesting story. Zachry Brierley JR (later Sir Zachry MBE) published an autobiography called "Following in footsteps" which traces the history of the Brierley Brothers' involvement in the area as well as his own business and political career. The Winter Gardens was designed by local architect, Arthur Hewitt, who also designed the Savoy and Palladium cinemas. In the later photo, the Creams Coaches office can be seen. Creams was one of Brierley Bros companies originally so they must have kept that part of the frontage when the building was sold to the Odeon group.
"Following in footsteps" was privately printed, presented to Sir Zachry's friends and acquaintances so not sold generally. The Conway Road garage was eventually taken over by GPO Telephones as their motor vehicle servicing depot. The houses now on the site are called "Llys Brierley" to commemorate the history.