To verify your identity, the data you provide will be processed by the Individual Registration Digital Service managed by the Cabinet office. As part of this process your data will be shared with the department of work and pensions and the Cabinet Office suppliers that are data processors for the Individual Electoral Registration Digital Service.
You may decide to be on the 'open register' which means that your information is publicly available for anyone seeking to verify your identify, or use the data for other purposes, such as direct marketing. Anyone choosing to use the public data will be legally responsible for ensuring that they comply with the law, including informing you of what they intend to do with it.
You can find more information about this here: