Slugs, snails and other pests in an urban garden

Is it just me, or are pests harder to deal with in an urban garden?
I have a huge problem with slugs and snails primarily. There are cats all over that come in to my garden and leave their waste, which I hear is food for slugs and snails. I can't get any natural predators in to eat them because there are none around, no matter how inviting my garden is for them.

I also seem to have a problem with aphids and leaf miners every year, though I think that is not an urban problem and could just be a matter of encouraging the right predators. I do have plenty of ladybugs/ladybirds, but they can't seem to keep up.

Then there are the pesky foxes that dig out my beds, and the cats that poop in them. I build chicken wire fences and covers to deal with those, which is a drain on my energy, but a necessary evil in this environment I think.

Anybody have advice? or care to join my rant?
I am in UK by the way, if that makes any difference.

Yeah urban gardens are rough for slugs. No hedgehogs, no ground beetles, nothing to keep them in check. Nematodes are the only thing that's actually worked for me, everything else just slows them down a bit. Worth doing in spring before the population explodes.