To avoid any confusion I must correct an error. Apologies. This shrub was see at Arduaine Garden on West coast of Scotland.National Trust Scotland In error I id it as Leycesteria stipulata ....as seen at Tiger Hill. I had to write to the head gardener about a Rhododendron and asked him to confirm my id. I was wrong. It is Leycesteria. But Leycesteria crocothyrsos with yellow flowers. See excellent write up by Owen Johnson. Leycesteria crocothyrsos - Trees and Shrubs Online