I did wonder if it could be a clivia HCA. Mine is in a pot indoors and doesn't like being outside even in summer.
1. Hebe, they don't like being pruned.
2. Aquilegia and I think the bulb might be Agapanthus.
3. Dead lavender
Went to see my father in law and went to Butters at Kellett Gate. They were selling orchids for £3.00. I bought two multi stemmed phaelonopsis and one enormous Tsarene orchid = £9.00. I would have bought more if I had boot space.
I'm sure Monty did a shade garden last year on GW. You might get away with a white garden with harebell, foxglove, snowdrop, brunnera etc.
Could the second one be a bluebell or a spring onion? They look similar.
I would cut down the brambles and tidy as best you can, and as you come across plants, post pics on here to identify. You could have some plants or bulbs starting to appear that you would want to keep.
I just looked on Ebay and you can buy a bare root plant for £6.99. No seeds though.
In the programme The Instant Garden they used aluminium edging which gave a neat edge. But there are lots of different types of edging out there.
I have tete a tete daffodils, violets, muscari, scilla, crocus, snowdrops, polyanthus, dog toothed violets and hellebores that do well if you're looking for suggestions.
That's the plant in the picture I was thinking of Busy.