Commentary on Sections Schedule 3: Services and public functions: exceptions Effect
709.Paragraph 18 provides an exception from the prohibition on discriminating against a person in the provision of services or the exercise of a public function because of their religion or belief in relation to decisions not to allow someone to enter the country or to remove someone from the country, if that decision is made on the grounds that it is conducive to the public good to exclude that person from the country or it is not desirable to permit the person to remain in United Kingdom.
710.It also provides an exception for decisions relating to an application for entry clearance or leave to enter to cover people entering the country to provide services in connection with religion or belief, such as a Minister or clergyman.