We can only find two references to this organisation: a references to its formation in 1780 (surely not the same one?) and an appeal reported 12 Dec 1916 in the New York Times that it made to America to aid Belgium against the Germans.
This section lists the memorials created by the subject on this page:
Netherlands Section of the League of Neutral States
Creations i
Fryatt at Liverpool Street Station
{Incised in the marble below the medallion:} To the memory of Captain Charles...
Other Subjects
1 memorial
Kensington men or men serving in Kensington battalions who died in WW1 or WW2
Men of Kensington and those men serving in Kensington battalions who gave their lives for king and country in the great war 1914-1918, 1939-1945.
1 memorial
Monck Brawne Associates
We can find no reference to this group at all but they existed in 1995.
1 memorial
R. Fus. (C. of L. Regt) 30th Batn. - London Regt T.F.
Royal Fusiliers (City of London Regt) 30th Batn. - London Regt T.F.
1 memorial