Hi Wak
Purcell & Betts 57 Aston Rd north between Holland Rd and Avenue Rd, they were located there from roughly 1905 when they took over from Henry Downes photographer and as far as I cam make out remained in business there until the premises were demolished. I have no information concerning a move to another premises although it is quite possible.
I would think owing to the longevity of the business that there will be loads of photos about, unfortunately I don't have one, but I will have a search about and see what I can come up with.