Does the policy allow local discretion in the way in which it is implemented? If so, what safeguards are there to prevent inconsistent outcomes and/or differential treatment of different groups of people?
Not in terms of implementation but clearly the process requires staff to make decisions. However, all decisions are reviewed by the National Intelligence Unit Central Authorities Bureau, and staff from the NIU communicate concerns and issues with relevant establishment staff. Practice is also overseen annually by the Office of Surveillance Commissioners (OSC). Those who believe they have been subject to covert surveillance can also apply to the Investigatory Powers Tribunal to investigate whether surveillance was carried out in accordance with the law.