Private day school for young boys at 90 Queen's Gate, run by Orlando Henry Wagner (1867-1956) and his wife Monica. Operating before WW1 but we can't find start and end dates. An old boy, Michael MacLagan, wrote in 1995 “... the horse-drawn omnibus which bore us all to Battersea for games."
The scholar, Sir Anthony Wagner, son of Orlando, attended the school.
2017: Via Facebook John Stevenson, very helpfully, told us "I was there from 1959-1961 - it was then still at 90 Queen's Gate. My grandfather, Orlando Wagner, opened the school in 1903 firstly at Alfred Place West moving to Queen's Gate in 1906."