Useful links for picture frames:

Wessex Pictures "Wessex Pictures is the No.1 UK framing wholesaler."
Lion Picture Framing Supplies. They have a very useful catalogue.
framers equipment "The little company with the big reputation for service, civility, and complete customer satisfaction"
uk picture framing supplies "specialise in offering smaller quantities"
charnwood "woodworking machinery and tooling, suitable for everyone from hobby enthusiasts, to professionals"
Learning resources
The Framers Forum A fantastic resource For Picture Framers and Picture Framing Issues
Art + Framing Today magazine Back issues of "Art + Framing Today magazine"
logan Helpful mount cutting tutorials on the "learning centre" tab
Lion Some very useful downloads on Lions "info store"
DIY Framing Quality downloads and advice on the "support" page
You Tube A great video teaching good border proportions
You Tube Pete Bingham demonstrates drawing and tinting French lines and makes it look easy!
Pete Bingham Pete Bingham has written a few books. He is a real expert and his books are full of good advice.
Vivian Kistler An American framer and author whose work is justifiably held in the highest esteem
J. Edwin Warkentin I found "Picture Framing as a Business" a great help when I was starting my business