This Memorial stone can be found in the toilets of the Emporium Theatre and Cafe on London Road, Brighton. The building was originally a Methodist Church and the plaque commemorates the work of Mrs S. E. Bond, who donated a Memorial stone for another nearby church, the Primitive Methodist Church on Viaduct Road, as well as seven others.
For more about the Primitive Methodist Church on Viaduct Road, mentioned in the Memorial stone, see the following page:
http://www.mybrightonandhove.org.uk/page_id__8749.aspx
Unfortunately, I could not find any additional information about the Methodist Church within which this Memorial Stone can be found.
Location: 50.832, -0.137