https://publicapps.caa.co.uk/docs/33...ice2017034.pdf
2 Scope
2.1 The new PBN regulations will require:
• That from 25 August 2018 pilots may only fly in accordance with PBN routes and procedures after they have been granted PBN privileges as an endorsement to their Instrument Rating (IR)
• All pilots with an IR or Enroute Instrument Rating (EIR) will need to have PBN privileges after the 25 August 2020.