UK based Agro forestry links for sourcing plants and info-

http://www.orchardnetwork.org.uk/

http://www.pfaf.org/user/default.aspx - plants for a future (Ken and Addy fern)

www.agroforestry.co.uk/ -  martin crawford

http://ediblecities.co.uk/j/ - Niels corfield

www.cooltemperate.co.uk/‎ - Phil corbett

http://coedforestgarden.co.uk/

Ireland -

www.futureforests.net/‎

GLOBAL

http://themanofthetrees.com/

http://www.ids.ac.uk/

http://internationaltreefoundation.org/

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International

http://www.worldagroforestrycentre.org/

Seattle - http://beaconfoodforest.weebly.com/