Cabbage why do you read the leaflet from the UK cat protection league I put as a link?
This isn't a wild cat it is a domestic and I guess the owner is looking for optimum health and life span.
Which reminds me shoe....has you cat had its flu injection and rabies? I can tell you were to buy the flu injection and the government vet will inject it free of charge and give rabies free. Plus it get's a little passport approved by the ministry of environment.