Currys unstoppable marketing / spam emails
It's not a secret that many websites and organisations will send you marketing / special offers regardless of how carefully you select correct checkboxes telling them that you don't want any marketing emails. In some cases the only difference selecting right boxes makes is that you will start to receive these emails not immediately, but a week or two later...
This is annoying, but at least most legitimate newsletters and marketing emails have working unsubscribe links and respect your choice to opt-out. Obviously, there are exceptions, both good and bad ones. And one of the bad ones is Currys.