Under the UK General Data Protection Regulation, Assimilated Regulation (EU) 2016/679 (UK GDPR), organisations transferring personal data outside the UK on or after 21 March 2022 can rely on two sets of standard of data protection clauses issued by the ICO as an 'appropriate mechanism': (a) the ICO's International Data Transfer Agreement (IDTA), or (b) International Data Transfer Addendum (UK Addendum). The UK Addendum enables the use of the standard contractual clauses issued under Commission Decision (EU) 2021/914 under the EU GDPR on June 2021 ('2021 EU SCCs' or 'new EU SCCs'). Under transitional arrangements for existing contracts entered into before 21 September 2022, organisations were permitted to rely on the 'old EU SCCs' (the SCCs issued under Commission Decision 2001/497/EC, Commission Decision 2004/915/EC and Commission Decision 2010/87/EU, also known as 'pre-2021 SCCs' or 'Model Clauses', which could be used in their original form or in a form slightly adapted for the UK GDPR). Organisations could continue to rely on those older arrangements to make restricted transfers under the UK regime until 21 March 2024. As the transition period expires, organisations relying on the old EU SCCs should, by now, have opted to use the IDTA or UK Addendum (appended to the new EU SCCs), or to an alternative appropriate mechanism to comply with the UK GDPR requirements for international transfers. Organisations who have not yet done so should reconsider their position.