All parts of the Yew, except for the red flesh surrounding the stone, are highly poisonous, having a paralyzing affect on the heart. It is vital to treat the Yew with extreme caution.
Yew is a beautiful tree, which can date back centuries, some are said to be several thousand years old. Your best chance of finding Yew, is in old church yards, where it was once law to plant them.
WOOD - The wood was once used to make long bows.
LEAVES - These are very dangerous so please don't use them
BERRIES - The fleshy red part of the berry is the only edible part. It is vital not to crack the seed within the berry. They have a sweet taste, but a strange texture, which gave rise to the name snot berries. I really would only advise you try these if you are an experienced forager!!!
EDIBLE PARTS - Only the red fleshy part of the berry. ALL OTHER PARTS OF YEW ARE DEADLY POISONOUS (see above)