4(1)If a travel document is retained under paragraph 2(2)(c) or 3(3)(c) while its validity is checked, the checking must be carried out as soon as possible.
(2)If it is established that a travel document taken from a person under paragraph 2 or 3—
(a)is valid, or
(b)is invalid only because it has expired,
it must be returned to the person straight away.
(3)A travel document taken from a person under paragraph 2 or 3 must be returned to the person before the end of the period of 7 days beginning with the day on which it was taken, unless during that period it is established that the document is invalid for some reason other than expiry.
(4)A requirement under sub-paragraph (2)(b) or (3) to return an expired travel document does not apply where the officer concerned reasonably believes that the person from whom he or she took the document, or some other person, intends to use it for purposes for which it is no longer valid.
(5)A requirement under sub-paragraph (2) or (3) to return a travel document has effect subject to any provision not in this Schedule under which the document may be lawfully retained.