The communication you have received will tell you if you need to respond, for some properties if there are no changes then you do not need to respond.
If you have been sent a canvass communication which asks you to make any changes you need to respond by law, and provide the information requested on the form. Completing the form only takes a few minutes. You need to include the name and nationality of everyone aged 16 or over who is resident and eligible to register to vote. If there are no eligible residents, you should state why this is the case. If anyone listed on the form is not living at your address, their name/s should be clearly crossed through. You can do this online at www.householdresponse.com/coventry, you will need the 2 part security code from the form.
There is a criminal penalty for failing to provide the information required by the canvass form to the Electoral Registration Officer of a maximum of £1,000. The penalty for providing false information to an Electoral Registration Officer is imprisonment of up to 51 weeks in England and Wales (six months in Scotland)or, (on summary conviction) an unlimited fine.