The beneficiaries of the WA, who are issued with a residence document under article 18 par. 4 of are defined in Article 10 in conjunction with Article 9 of it. For more information, click here.
In addition, according to Article 2 (d) of the Withdrawal Agreement, “United Kingdom national” for the purposes of the Withdrawal Agreement means a national of the United Kingdom, as defined in the New Declaration by the Government of the United Kingdom of Great Britain and Northern Ireland of 31 December 1982 on the definition of the term “nationals” together with Declaration No 63 annexed to the Final Act of the intergovernmental conference which adopted the Treaty of Lisbon. You may find here an official table from the British Embassy in Athens regarding the UK nationals and whether they enjoyed free movement rights under EU law before the end of the transition period or enjoy rights under the Withdrawal Agreement as right holders, depending on the type of passport (issued by UK Authorities) they hold. If the person concerned is not a Withdrawal Agreement beneficiary, then for his/her residence in Greece, the national migration legislation (Law 4251/2014) for third country nationals is applied and competent are the authorities of the Ministry of Migration and Asylum.
It is important to note that the fact that a UK national is a Withdrawal Agreement beneficiary in a Member State (for example in Greece), this doesn’t mean that he/she is Withdrawal Agreement beneficiary and enjoys the citizens’ rights foreseen in the Agreement in any other Μember State of the EU, unless he/she meets also the requirements set out in the Agreement in the other Member State.