15. Powers of immigration officers and the Secretary of State.

The power to give or refuse leave to enter the United Kingdom1 is delegated to immigration officers2 but the power to give leave to remain in the United Kingdom, or to vary any leave to remain3 as regards duration or conditions, or to cancel any leave4 is exercisable only by the Secretary of State5. Unless otherwise allowed by or under the Immigration Act 1971, such powers must be exercised by notice in writing given to the person affected6, although provision is now made for certain persons to obtain leave to enter by passing through automated gates7. Immigration officers (and