Hello John, Many thanks for your interest. I have since found an accredited stained glass restorer in Bolton, 'Design lights' who have taken pity on me & very kindly offered to relead my roundel for the princely sum of £5.00 ( !!! ) as to restore the original leading would not have made it safe to hang, they'll 'black up' the lead so that it doesn't look so modern. I think there is no way I could trace the roundel's history & artist SCD (signature letters on top of each other) as folks tell me there were no registers of victorian glass painters. As I'm sure you know, Wagner died in 1883, so the signed date of 1888 seems to me to be related to this event, possible a commission by a lover of Wagner's music, like me ! I'm afraid I haven't got a digital camera, tho' being an 81yr old medical photographer in my youth, so can't send you a photo. Thanks again, June