One hooded corner tray in the hall cupboard, shared by two small cats. It's a one bedroom flat, so they don't have far to go.
The hooded corner tray was the same style they had in their birth home, shared between 5 kittens, so I guess they reckon having one between just the two of them is luxury!
I would be able to squeeze another tray in if need be, but it would probably have to be in the bedroom, so I'm grateful the chaps are happy to share. As Suzanne says, once you add one there's no going back.