Catchment school is a term used in Britain equivalent with “zoned” school that we use in U.S.A. Your full ADDRESS determines the schools where you would be given PRIORITY admission. Catchment/ Zoned school guarantee a place for all students who live in a designated area. Zoned neighborhood schools are your first option when looking for a school. This works for both public and private schools. The policy for catchment / zoned private schools differs from the public school one. You have to apply and reach some criteria to get accepted in one of catchment private schools. Parents have a right to express a preference for a particular school and the Council will accommodate this wherever possible. Places are not allocated until demand is assessed against the number of available places at individual schools.

It seems to me that you are dealing with a catchment (private) school.