No, not Art, ART - the Agroforestry Research Trust. The organisation is a registered charity in Devon run by the energetic and much-talented Martin Crawford based on the concept of Forest Gardening or Agroforestry., i.e. "the integration of trees/horticulture to create a more diverse growing system." Find out much more at: agroforestrey.co.uk
ART publishes a quarterly journal covering such topics as Truffle growing, Trees and shrubs yielding edible oils, The importance of bees in nature, Forest products from insects. Some of them are fairly whacky ideas but equally fascinating and inspiring.
But I am mentioning it now because I have recently received their annual catalogue of Fruit trees, nut trees, plants, seeds, books and sundries and I strongly recommend any enthusiastic gardener to get it. Not only does ART aim to offer the most comprehensive range of fruit and nut plants in Europe - everything from an extensive range of apple trees to mulberries to ginko and pecan nuts, grapes to goji berries, but it is also a fascinating read. This is obviously where I discovered the origin of Mahonia aquifolium as an edible fruit plant but where else would you discover Aquiligia vulgaris (Columbine or Granny's bonnet!) listed under Vegetable and salad plants. Three varieties of fuchsia are also sold for the fruits!
ART runs courses and can also be visited - it is definitely on my list.