The hon. and learned Gentleman askes what the policy objective is of not having such a defence. The clear policy underlining this is the Government’s policy of not revealing the existence of data retention notices. They are kept secret because revealing their existence could damage national security and hamper the prevention and detection of crimes, because criminals may change how they communicate in order to use a provider that is not subject to data retention requirements. Clause 84 places a duty on providers not to reveal the existence of notices.