A police officer shall undertake a separate identification process for each of 2 or more suspects if—
(a) the officer is attempting to ascertain—
(i) which of the suspects committed an offence; or
(ii) if the suspects may have been jointly involved in the offence—the identities of the suspects; and
(b) for that purpose, the officer intends to conduct an identification parade or to identify a person by showing a photograph or a picture of a suspect to a person.