Where do I find Edwardian Stained Glass windows?

I need two stained glass windows for my house.
Can anyone help suggest a good company in London North area that either salvages stained glass windows, or makes them to order, but so thet they look old and original.
Preferably a company that you would personally recommed, not just ones out of the phone boook, I can look up Yellow pages myself- I am looking fore recommendations. Thanks.
Thanks.