Posted: 20/06/2016 at 18:39
1. Corkscrew Hazel
2. You have a phormium which the long strap like leaves, to its right is pieris.
3. The large leaves are a hosta, the sword shaped leaves are crocosmia. The pale leaves belong to a sorbaria.
4. Scrape up the slate chips and lay a double thickness of weed membrane and the put them back.
The blue one is another hosta and to its right is another Acer (Jap maple).
You've inherited some very nice plants. I can't enlarge some of the pics, but you also have some dwarf conifers and I really don't know those.