In reply to:
Anonymity of the internet is a myth.
But what information is available about you just by knowing your IP? Do a Whois on your IP and see what you get. In my case, there is a lot of information about my ISP but no mention of me. An rDNS gives a little bit more. And I think I could reduce that if it mattered.
The ISP should keep records of my connections and traffic, solely to protect themselves against me breaking the law. (Similar to the situation if your car is involved in an offcence, you may be held liable if you can't or won't identify the driver at the time.) In specific circumstances, even without the RIP act, the ISP may be required to divulge incoformation to a court, e.g. your identity if you have published something libellous through their system. Within the strict controls the RIP Act imposes on the security forces, if an investigation has been authorised, and there is sufficient reason to indicate that you may have information that could help that investigation, you would be required to provide the information they seek. It is unlikely that they would ask you to do so if you were party to the activity itself, this is much more along the lines of helping them with their enquiries and refusing has always been an offence, long before RIP. Why wouldn;t any responsible citizen not want to assist the authorities in the pursuit of criminals and terrorists? The sginificant point here is that your ISP would be in very serious breach of another law (Data Protection and Privacy) if they allowed anyone to have access to your personal data
If you have registered a domain, a whois enquiry on that domain will give some information about you, but if you are an individual and the domain is a .uk one, then the amount is minimal. Several of mine don't even name me.
What could someone do with such information? It is not easy to acquire, the electoral role and the telephone directory are easier and more use.