Probably one of the yellow cultivars of a Philadelphus
I've see them listed as Scilla campanulata (Hyacinthoides hispanica) so assume a synonym. I didn't know they weren't for sale anymore.
good plan Janabelle
Not sure that there's a weedkiller that would kill sedge without killing grass
one of the sedges I think. Usually damp ground plants so improving drainage might help
I'm sure someone can help Metalmama but gerberas and the like are not something I know about
1 ragwort, out
2 Dock below the foxglove, out
3 could be a scabious and far too many slug pellets, consider the wildlife and the food chain.
4. can't remember its name but a weed, out