Re: Grocers Hagley Road Birmingham 1890 - 1936
The 1912 electoral roll has Frederick and Frank Webster at 187 Hagley Road, which is described as a house (joint) - there is no 189 shown, the next property is 191.
The 1925 roll gives Frederick Webster at 189 Hagley Road with the note "Abode 2 Park Hill Road, Harborne."
I think the shop is one of this row.