I don't understand this bit.
" ... as the combination of IP address and time of service usage can uniquely identify users."
I'm puzzled as to how this would work or give any additional risk to my privacy. Website operators already know that live in Mytown in England and use VM as an ISP, but that's as far as it goes, I think. When I'm away from home, they know I'm somebody who uses the O2 network but they don't know that I'm the same one who lives in Mytown, unless I don't clear my cookies.
Can anyone propose a 'scenario' that explains the additional risk to my privacy; one that doesn't involve VM or O2 giving out information about me. (I assume they don't do that for anyone except the police and security services.)