Section 19 of PACE (the Police and Criminal Evidence Act 1984) states:
(3) The constable may seize anything which is on the premises if he has reasonable grounds for believing—
(a) that it is evidence in relation to an offence which he is investigating or any other offence; and
(b) that it is necessary to seize it in order to prevent the evidence being concealed, lost, altered or destroyed.
It has been suggested by officers on YouTube videos that the person recording the video has evidence of a crime on their mobile, that they've recorded; thus they're seizing their phone under PACE. But section 19.6 states:
(6) No power of seizure conferred on a constable under any enactment (including an enactment contained in an Act passed after this Act) is to be taken to authorise the seizure of an item which the constable exercising the power has reasonable grounds for believing to be subject to legal privilege.
So my question is: what stops someone about to have their mobile seized from telling the police officer that there is legally privileged information on their phone? They could even keep an email from a solicitor on it, which would fulfil the requirement.
Would this legally prevent them from seizing the phone?