http://www.legislation.gov.uk/ukpga/2003/6/section/33/enactedPolice (Northern Ireland) Act 2003PoliceKing's Printer of Acts of Parliament2021-08-04 Part 2Police powersDesignation of civiliansDesignations: supplementary 33 1 Subsection (2) applies if, in reliance on his designation under section 30 or 31, a person exercises or performs a power or duty in relation to another or purports to do so. 2 The designated person must produce his designation to the other if requested to do so. 3 A failure to comply with subsection (2) does not make the exercise or performance of the power or duty invalid. 4 The Chief Constable may at any time modify or withdraw a person’s designation under section 30 or 31 by notice to him. 5 If the Chief Constable modifies or withdraws a person’s designation under section 31, he must send a copy of the notice of the modification or withdrawal to the contractor responsible for supervising the designated person in the carrying out of the functions for the purposes of which the designation was granted. 6 In subsection (5) “contractor” means a person who has entered into a contract with the Board such as is mentioned in section 31(1).