Okay. Just seen this for the UK:


Who can register to vote
Make sure you register to vote
You aren't automatically registered to vote, even if you pay Council Tax

You can register to vote if:
you are aged 16 or over (but you cannot vote until you are 18)
you are a British citizen
you are a qualifying Commonwealth citizen. A qualifying Commonwealth citizen is an individual who has leave to enter or remain in the UK, or does not require such leave
you are a citizen of the Republic of Ireland or other European Union (EU) member states


http://www.direct.gov.uk/en/Governme...ions/DG_073239

From the BBC:

"To be registered to vote in the general election you must be 16-years-old or over by election day, resident at the address stated on the registration form, and resident in the Isle of Man for at least one year."

http://www.bbc.co.uk/news/world-euro...f-man-12251606