Feline faeces and all that.

Good luck with scaring off the cats but I think they'll wise up to it shortly.

Depends on wether that cat spooks them. Back when I lived in Latvia our cat always went in the garden and made sure to bury it all. However, when it came to winter and snow it was more difficult and we knew spring was coming when the snow started melting and little brown piles were showing up

How horrid. If the silly looking ornamental cats spread about help then what of it? The only other things I can think of repellents and an electric fence.

Get a dog My garden also looks like a scrap yard due to the bits of wire netting all over the place to try to save some of my flowers from the deer. The cat issue is a never-ending problem these days, with so many cats around. Luckily we don't seem to have that particular problem very often. You can buy cat repellent granules, some of which smell of garlic, or lion poo as suggested by @Orson_Kart, and aluminium ammonium sulphate is also supposed to be effective, but all these things are quite expensive and have to be reapplied fairly frequently, especially after rain. Then there are those ultrasonic things that go off when they sense movement. Unfortunately for me I can hear them perfectly well so when I deliver the village magazine to one particular house I have to dash to the door with my fingers in my ears while holding the magazine in my teeth. Otherwise my best suggestion is to not have any uncovered soil, because that is what they like best. Mulch around plants with grass clippings, wood chippings, gravel or whatever you can find, the spikier the better - holly clippings are great! And cover any seed beds with wire netting.

I’m so grateful we don’t have cats wandering around our neighborhood and leaving deposits. The deer do that. I have that exact ornamental cat, among others, in my garden. They are only there because they look like my beloved Doodles the cat.

I doubt that the cats will be deterred. I haven't seen any cats around recently.

My neighbor’s cat used to poop right in front of my door. Sick of it, I got a glove, and started depositing the poop right in front of the door of the cat’s owner. I never had to worry about it again. Obviously, that won’t work for you. But it does beg the question why owners of dogs are shamed for not picking up after their dogs. Yet cats can roam free to share their excrement with whomever they wish. Let us know if this new avenue of poop protection proves to be an effective deterrent.

I’ve read that the solution is to lay piles of larger cats poo (e.g. Lions) around the garden. The theory being that the smaller cats will know the poo comes from larger, scarier cats, and will avoid the area. I’m not sure where you can get lion poo, maybe a zoo or try Amazon? I don’t think Ocado do poo deliveries.