This article does not mention the Telephone Preference Service. It's a useful step to take. The article doesn't mention the fact that most mobile providers in the UK have free numbers that you can forward spam texts to. There's also a problem with a gap in the law that allows "genuine market researcher" to contact you to -- this loophole is used by some companies as lead generation.
It's funny how political parties always seem to wind up exempt in election season, too.