Here is the website which answers questions such as these ones:
- How do I check that I'm registered to vote?
- Who is eligible to be registered?
- How do I get on the Electoral Register?
- What if I haven't had a form from you?
- I've been refused credit/mortgage because I'm not on the Register. What can I do?
And for your information as soon as the referendum is out of the way there will be a move to individual voter registration (rather than the present household registration). More details can be found here.