http://news.bbc.co.uk/1/hi/technology/7291637.stm
"Open Rights Group questions Phorm

The Open Rights Group has published its concerns
Campaign body the Open Rights Group (ORG) has called for further detail on the workings of ad system Phorm
"

regarding the RIPA, you would think someone in the Home Office if asked, when all this began back in january, would come to the conclusion that Targeted online advertising services should be provided
with the explicit consent of ISPs' users.
OC
with the Consent of the ISPs'
user and web page host would make that interception clearly lawful,perhaps.
it might also be argued that consent of a web page host is satisfied in such a case because the host or publisher who makes a web page available for download from a server impliedly consents to those pages being downloaded.
however, keep in mind that
'explicit consent' ,and this is Key, IF they dont get this
'explicit consent' and the web page host were make the time to put a disclaimer on their pages forbiding interception by any such profiling elecronic device then interception is clearly unlawful.
something to consider anyway.