The Electoral Register is the list of everyone who is registered to vote in a local area . You’re not automatically registered even if you pay council tax. There are two versions of the register - the full version and the edited version(sometimes called the 'Revised Electoral Register). Your details will appear on the full version of the register but you can choose to exclude your details from the edited version when registering.
The full register is used for elections, preventing and detecting crime and checking applications for credit. The edited register is available for general sale and can be used for commercial activities such as marketing.