What is the definition of UK parliamentary elector?

A UK parliamentary elector is an individual who is eligible to vote in parliamentary elections in the United Kingdom. To be considered an elector, a person must be at least 18 years old, a citizen of the UK, a qualifying Commonwealth citizen, or a citizen of the European Union residing in the UK. Electors must also be registered on the electoral roll to participate in elections for Members of Parliament (MPs) in the House of Commons.