That's always a borderline case when you buy something from a company. They often use that as a way to send you e-mail, or phone calls, claiming that you have a relationship with them.
Opt-ins really need to be made clearer, and must be an option.
John Lewis has been ordered to pay damages for sending "spam" emails in a privacy ruling that could open the floodgates for harassed consumers.
Roddy Mansfield, who is a producer for Sky News, brought the case under EU legislation that prohibits businesses from sending marketing emails without consent.
At a county-court hearing a judge ruled the company acted unlawfully as it could not prove Mr Mansfield had agreed to receive the emails or was one of their customers.Court Ruling Finds Major UK Retailer Guilty Of Sending Email Spam [lbc.co.uk]
BTW, thanks to g1smd for the heads up on this.