Vital Seeds, based in Devon, specialises in UK-grown organic, open-pollinated seeds. They have just launched an online seed-saving course which can be accessed by anyone. While there is a fee to enrol, Vital Seeds offers a discount for professional/community growers. Get in touch with them at email@example.com for more information.
Learn more here.
Longo Mai and The European Civic Forum produced the Seed films including 30 crop guides and other videos on seed saving. You can watch them here.
Seed Savers Exchange have two very useful and short videos on Population Size and Isolation. They have other good videos on their Youtube channel.
The Organic Seed Alliance have a set of in-depth webinars going through most aspects of seed production.