The nearest match we can find is "The Abruzzo and Molise Heritage Society of the Washington, D.C. Area" but it's unlikely that they installed the Tosti plaque in London.
This section lists the memorials created by the subject on this page:
Assoc. Abruzzo-Molise, G.B.
Creations i
Sir F. Paolo Tosti
City of Westminster Sir F. Paolo Tosti, K.C.V.O., musician, 1846 - 1916, liv...
Other Subjects
Benjamin Cotton
Benjamin Cotton was born on 10 February 1794, in Leyton, Essex (now Greater London), the ninth of the ten children of Captain Joseph Cotton (1745-1825) and Sarah Cotton née Harrison (1751-1818). On...
Basil Marsden Smedley
Barrister and local politician in Chelsea. Born and lived his entire adult life in Chelsea. At the age of 16 lost the use of his right arm. Member of Chelsea Borough Council 1928 until his death. ...
The Arts Club
Private members club founded by, amongst others, Charles Dickens, Anthony Trollope, and Lord Leighton. "This Club is instituted for the purpose of facilitating the social intercourse of those conne...
George Green Association
We can't find any information about this group, so can only assume that it's now defunct.
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