White slugs ruining lawn

I’ve treated my grass over and over with Nematodes thinking the small white grubs were leather jackets, it turns out they’re actually small slugs with little tentacles. Is anyone able to tell me what type of slugs they are and how to get rid of them please?

 

What problem are they causing to your lawn?

 

Looks like they’re eating the roots of the lawn. The slugs are definitely living in the ground and coming up in the evenings when the grass is moist.

 

Well I'm not sure they do that but maybe someone will come along who knows.

 

Maybe the slugs are just part of the "landscape" but you also have grubs. I'd lift a piece of turf to see.