The new UK MEPs elected in May 2019 are listed here. They took up their seats on 2nd July 2019. European elections were held in all EU member states Member States in the period 23rd - 26th May 2019. In the UK they were on 23rd May.
In England, Scotland and Wales the voting system for the European elections is the d'Hondt system of proportional representation - regional closed list. In Northern Ireland the system is Single Transferable Vote.