The UK issues licences in accordance with ICAO Annex 1 and will continue to do so. It is a recomendation of ICAO Annex 1 that all ICAO States recognise PPLs issued by other ICAO States.
EASA is not a member of ICAO and is not eligible to be one yet one of its objectives set out in EU Regulation 2018/1139 Chapter 1, Article 1
(g) assist Member States, in the fields covered by this Regulation, in exercising their rights and fulfilling their obligations under the Chicago Convention, by ensuring a common interpretation and a uniform and timely implementation of its provisions, as appropriate;