it's a leycesteria formosa. known as Himalayan honeysuckle or Pheasant berry. It is not related to the honeysuckle. It can be pruned back heard every spring to keep it within a good size. It will self seed round the area, but the seedlings are easily recognisable and removed.

I was going to answer this earlier, but for the life of me I could not remember the name. I have one which I am waiting for it to flower, where the red bracts do not develop,so it appears to have a large white flower rather than a red one with a white centre.

Are both pictures of the same plant? I thought the top one was a goat willow.

No, they are not the same plant, Bulbaholic,so thanks for the clue.
Thanks also to 2ndhand for such detail on the lower pic.