30 seconds with Google was all you needed.
http://www.partmaster.co.uk/diplomat/adp3101/door-glass/catalogue.pl?path=660841,357700:357733&model_ref=558379&refine=door%20glass
http://www.espares.co.uk/search/mo546739pt1594/cookers-and-hobs/doors/diplomat/adp3101
Probably more out there for those bothered to search
XXX
November 2015