Philippe Gautier writes

Hello, my try:

1. Stonecrop (Sedum)
2. Erigeron

3. Linaria purpurea
Yes, probably, though a close up would confirm

4. Chrysanthemum ??
Mayweed, if it has aromatic leaves

5. Crocosmia (lucifer?)
6. Bryonia dioica (=weed?)
Aka White bryony. A UK native with red berries.

8. Geranium sp.
Possibly one of the UK natives. Keep or not depending on how much you
like it.

9. Lavendula angustifolia var.
10. Hebe sp.
11. another Lavendula?
Yes.

12. Corydalis lutea (could be considered as a weed as wel...)

oh and 7. Maybe Berberis (trifoliata???)
Berberis, definitely not mahonia.
--
Kay