Require voter consent for political parties to access electoral register data

Many voters are unaware that political parties can obtain their name & address from the full electoral register & use it for campaigning. Opting out of the open register does not prevent this. Voters should have greater control over how their personal data is used. Allowing an opt-out or requiring consent would protect privacy while still letting people who want political contact to receive it. We believe it also appears inconsistent with the consent principles in UK GDPR & Data Protection Act.