I spent a long time with the Council and Environmental health and they said as we are private home owners with no neighbours that don't have fields seperating us and all the cats and done there were no issues also we own the woods and paddocks they roam in
We also go to the tip on a weekly basis with cat litter which amounts to 1 bag of wood pellet, and half a bag of clumping clay and dispose of them in the garden waste as they are biodegradable
It depends on the Council and if you own/ or rent your home some councils only allow 2 cats and 1 dog in Scotland not sure about the rest of the UK