I have been buying books regularly from this shop for about 7 years (from 2007) and I have always found Louise, the proprietor, to be most helpful. If she does not have a particular book in stock she orders it immediately and it is often available for purchase the following day.
I am not convinced that this shop continues to trade. The location flag puts it somewhere in the region of Summerfield, however the 2nd-hand bookshop beside the river has now closed.