Stained glass window at St George's Cathedral by Christopher Whall and Karl Parsons, later than1908.
Christopher Whall was a stained glass artist who worked closely with William Morris. His work is in several English churches. He was also a notable teacher ("the design of the window must relate to the architecture of the frame") and one of his pupils was Karl Parsons, with whom he worked on the windows at St George's Cathedral. en.wikipedia.org/wiki/Christopher_Whall
Parsons was soon to start his own studio and also had a notable creative career. One of his stained glass designs was used for a stamp in Britain in 1992.
The design of the St George's Cathedral glass represents a major work in their catalogue. Both were at the peak of their creative powers when the window was made. Which of them was the principal artist? To help you decide, on stylistic grounds, I put together Galleries of their other work from other Flickr photostreams.
Christoper Whall www.flickr.com/photos/myskygarden/galleries/7215762854923...