Scroll down to "Makers"
http://en.wikipedia.org/wiki/Stained_glass_-_British_glass%2C_1811-1918

Kempe
http://en.wikipedia.org/wiki/Charles_Eamer_Kempe

Clayton and Bell
http://en.wikipedia.org/wiki/Clayton_and_Bell

The Stained Glass Museum
http://www.stainedglassmuseum.com/index.shtml

There are 39 artists listed here, but you'll need to click in to see which were working at the turn of the century:
http://en.wikipedia.org/wiki/Category:Stained_glass_artists

Hope this helps!