If like me you are fed up with cold callers constantly ringing the website to use is http://www.tpsonline.org.uk but if you google it the top listing is telephonepreference.org.uk. Don't use that one they charge you for it - it's a free service.
This sort of thing really grates. I've seen this for other things too - the European Health Card for one. It's an easy way to make money - you take someone's details, go to the official website and re-enter them then charge a tenner! Should be outlawed.
Please