Posted: 18/05/2016 at 08:54
I think 3 is one of the umbellifers, cow parsley maybe
4, one hopes they haven't put goosegrass in so Galium odoratum as Darren suggests or G. mollugo, hedge bedstraw.
1, agree, mallow
2, no idea
If you haven't got hedge bedstraw I know where there's lots