The data base of Listed buildings is maintained by Historic England and it may be searched here; Search Historic England for Listed Buildings .
If you find difficulty finding the property you seek one way is to search for “Reading” and then scroll down the list and search manually.
Members of the public may submit their photos for inclusion on the the Historic England List by accessing the site Enrich the HE list
Another source is Listed Buildings On Line. This site uses listing information from HE it has included images submitted by members of the public for some time.