25.—(1) Where in relation to anything done by a relevant officer (“R”) a provision of the 2016 Act, as applied by this Schedule, confers a power or imposes a duty on a relevant officer who may or must be a person other than R, the power may be exercised or the duty performed by a constable (and where it is, the power or duty is to be read without the modifications made by this Schedule).
(2) Where in relation to anything done by a constable (“C”)—
(a)a provision of the 2016 Act confers a power or imposes a duty on a constable who may or must be a person other than C; and
(b)the provision is applied by this Schedule to a relevant officer,
the power may be exercised or the duty performed by a relevant officer (and where it is, the power or duty is to be read with the modifications made by this Schedule).
(3) In this paragraph “relevant officer” means an immigration officer, a designated customs official or an officer of Revenue and Customs.