http://media.ofcom.org.uk/2013/01/16...tect-children/
Currently Ofcom can only prosecute 'video on demand' adult websites, but the conservative government plans to extend this to all internet sites.
Age verification requirements go well beyond 'are you over 18'. i.e. German style requirements.
In other words, this time next year it will be effectively illegal to run an adult affiliate site from the UK.
Maybe time to revisit some of those 'best places in the world to run an adult company' threads.