As I’ve written on several occasions recently, the sending of direct marketing emails without the consent of the recipient is, as a general principle, unlawful under European and domestic law.
The Information Commissioner’s Office (ICO) guidance makes clear that promotion of a political party, campaign or candidate is “direct marketing” for the purposes of the Privacy and Electronic Communication (EC Directive) Regulations 2003 (PECR):
We take a broad view of what constitutes marketing and are satisfied that it is not only the offer for sale of goods or services but also includes the promotion of the aims and ideals of any organisation including political campaigns.
If you provide your email address…we may use the email address to send you further information in the future. You may at any point request not to receive such information any more.