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
John Donovan
Founder of Friern Barnet & District Local History Society. Lived in Friern Barnet between 1966 and 1995.
Hyde Park Estate
We don't know for sure that the HPEA is the "Hyde Park Estate" that erected the Dearmer plaque but it's the best candidate that we could find.
Albion Tavern
26 Russell Street (previously Great Russel Street). Â Pubs History lists licencees from 1848 but it dates back to the 18th century at least. Â Closed by 1922.
Sir George Williams
Founder of the Young Men's Christian Association. Born Somerset. Died in a hotel in Torquay.
Baker Street Irregulars
The Baker Street Irregulars is a literary society dedicated to the study of Sherlock Holmes, Dr. Watson, Sir Arthur Conan Doyle, and the Victorian world. It is the oldest existing Sherlockian soci...
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