As I said they work for me otherwise I wouldn’t have shared it. I have densely packed flower beds too - I trim the lower leaves off and thin out my beds a bit. Also I plant stuff mixed into the beds that slugs don’t like.
Nothing works on its own, it takes a multi-pronged approach. Will post some Lupins over the weekend- slugs love them but I manage to keep them at bay.
Btw - we have enormous yellow slugs in Norfolk so don’t think you are worse off!
NB water early morning before sun is up - watering in the evening leaves wet soil overnight and attracts slugs!
Also I don’t put plugs straight in ground - I I let them establish themselves in pots first for several months - or pack wool pellets round them.
Good luckView attachment 204249
The GQT team made a remark about slugs. The huge slugs eat the smaller species slugs