s 226IA Safeguards relating to examination of third party bulk personal datasets
(1) The Secretary of State must ensure, in relation to every third party BPD warrant which authorises the examination of a bulk personal dataset, that arrangements are in force for securing that any examination of data contained in the dataset is necessary and proportionate in all the circumstances. (2) In doing so, the Secretary of State must in particular have regard to the information that is reasonably available to the intelligence services in relation to the examination of such data.