From the article: "Those ICRs in effect serve as a full list of every website that people have visited, rather than collecting which specific pages are visited or what's done on them."

And from another site on the same issue: "When you visit a website you usually start at the websites homepage such as www.bigbrotherwatch.org.uk/ the Government define this part of a website address (the part before the first forward slash) as communications data which they consider to be non-intrusive information." (https://www.bigbrotherwatch.org.uk/wp-content/uploads/2016/0...)