Stevenson signed himself as Myranda (a elision of his wife's name, Myra, and their surname) to avoid being confused with another sculptor of the same name.
We have not yet found much information about this sculptor but believe this is our man. Also Wikipedia has a page about his Askari Monument or Dar es Salaam African Memorial in Tanzania.
Other work shown here and here. Born Great Britain. Died Brompton Hospital.