Any question answered...

Found it:

How do I know if I can vote?
Most people should have received polling cards through the post. To be eligible to vote, you had to be on the electoral register by 6 May. Anyone over 18 on 22 May who is a British citizen living in the UK, a qualifying Commonwealth citizen living in the UK, a citizen of the Republic of Ireland living in the UK, or an EU citizen living in the UK can vote if there is a local election where they live. British citizens living overseas can also vote in the European elections provided they have registered as overseas electors. EU citizens living in the UK can only vote in the European Parliament elections if they don't vote in their home member state.