breach is likely to result in a high risk to the rights and freedoms of a data subject, the controller shall, after the notification referred to in section 25, communicate the personal data breach to the data subject without undue delay. (2) The communication to the data subject shall describe in clear language the nature of the personal data breach and set out the information and the recommendations provided for in section 25. (3) The communication of a personal data breach to the data subject shall not be required where – (a) the controller has technical and implemented appropriate organisational protection measures, and those measures were applied to the personal data affected by the breach, in particular, those that render the data unintelligible to any person who is not authorised to access it, such as encryption; (b) the controller has taken subsequent measures to ensure that the high risk to the rights and freedoms of the data subject referred to in subsection (1) is no longer likely to materialise; or (c) it would involve disproportionate effort and the controller has made a public communication or similar measure whereby data subject is informed in an equally effective manner.