I also heard lion dung is a good deterrent, but where I'd get that from, god knows. The only lions we have here are in zoos!
Amazon sell it. Possibly also the big gardening shops like Dobbies.
Edit.
It's called Silent Roar, and marketed as a cat repellent. There is a fox repellent called Scoot, which is a synthetic fox scent. The idea is you keep applying the scent to the perimeter of your garden, like a fox would and have a little scenting war with the foxes. Eventually you'll win. You have the keep applying it.
However, scent deterrents really only work for territory wars. If the fox knows there is easy food and can't SEE another fox, a dog, or human it's going to ignore the scent.
Electric wire, raising your fences, or a very secure enclosure are really your only options in suburban UK (there's a fence topper you can install that prevents foxes entering but it is not cheap). You COULD speak to the R(S)SPCA about relocating it to protect your animals, but they'll likely not do it because it would be pointless; another would take the territory in no time. This is why you'll always see people who have to resort to killing predators having to do it repeatedly.
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