Unknown flower(Fruit)

This plant appeared in my garden about three years ago.
  It's not something I have planted.And there is nothing like it in either of my adjacent neighbours gardens.
 This is the first year it has flowered and it is quite a large bell shaped pendulum flower.Very pretty pink in colour. It now has quite large fruit on it.The ripe ones are quite black with a number of red ones still to catch up.
  Any of you keen gardeners have any ideas?