Who can register
You need to register at the address where you live. You can register if you are 17 years old or over, but in order to vote you must be 18 or over and a British, other Commonwealth, Irish or other European Union citizen.
If you are a European Union citizen who is not British or Irish you are not entitled to vote at United Kingdom parliamentary elections. You can vote at local elections and can choose to vote at a European parliamentary election either for your Sutton address or for your own member state's area.
If you spend roughly the same time at two addresses - for example, you may be a student or working away from your normal home - you can register at both addresses. But you can only vote once at the same election.