Where an intercepting authority makes an application to the Secretary of State for the issue of either a targeted interception warrant (where the purpose is to authorise or require the interception of communications sent by or intended for, a person who is a member of a relevant legislature) or a targeted examination warrant (where the purpose is to authorise the selection for examination of the content of such communications), the warrant must be approved by the Prime Minister.
Warrantry Sections 26 and 111 Section 26