This is Twiglet, a feral kitten we had been feeding. The morning after a big storm, we noticed she appeared in pain. Turns out she had a broken leg. We couldn't see her suffer so it was a case of emptying the bank account and getting her to a vet.
She's fine now and living with little Sausage and a lot of other cats and dogs. We would have kept her ourselves, it's just that Rosie is not good with cats and also living 4 floors up is not a good place for a cat.