What are your 'go to' nail treatments?

Recently my nails have been looking pretty sorry for themselves, they're so stained to the point I can't even look at them naked so they constantly have to be painted, which is bad I know, as one of the main reasons they're stained is because I don't let them breathe! Also, for as long as I can remember, they've been full of ridges and constantly peel no matter what I try and do to stop it.

Can any of you lovely followers recommend some products to me to help make my nails healthy again? They can be UK or international brands, as long as I can get my hands on them easily enough. I'd really appreciate all the help & advice I can get, my nails seriously need cheering up. If you can also recommend the best cuticle creams/oils you use too! Especially since it's so cold here in England now, my hands need some loving!