Sambucus nigra.
Elderberries are native to the British Isles, the small dark colored elderberry makes an excellent "port" style wine. Great for adding to Kombucha and meads. Can use to make a syrup for boosting the immune system.
The appearance of berries on the bushes is said to have signaled farmers when to sow their wheat. The berries are also reputed to have been used to make one of the first black hair dyes in ancient Greece.