Privacy and Electronic Communications (EC Directive) Regulations 2003
The Privacy and Electronic Communications (EC Directive) Regulations 2003 is a law in the United Kingdom which made it unlawful to, amongst other things, transmit an automated recorded message for direct marketing purposes via a telephone, without prior consent of the subscriber.
This is somewhat similar to the US Do not call registry, however it includes all electronic communications such as email or SMS mobile phone messages.
One of the key points of this legislation is that it is unlawful to send someone direct marketing who has not specifically granted permission (via an opt-in agreement). Organisations cannot merely add peoples details to their marketing database and offer an opt out after they have started sending direct marketing. For this reason the regulations offer more consumer protection from direct marketing.