This might help Sue, I just found this on line:
Another interesting collection of "Favrile" is held in a museum in the small Northern English town of Accrington. Haworth Art GalleryThis collection was donated by a locally born man, Josepth Briggs, who left England in 1891, and who worked with L.C. Tiffany on many projects over many years, being Tiffany's works manager amongst other jobs. Briggs' personal collection was donated to the town in 1933.
http://experts.about.com/e/l/lo/Louis_Comfort_Tiffany.htm
One of Tiffany's North African paintings