The proposed "Internet Connection Records" in the Draft Investigatory Powers Bill will potentially log every web site you have visited and retain that for a year.
If you are reading this blog post, you would now have an "Internet Connection Record" showing that you visited pornhub.com, or more specifically pornhub's content delivery network cdn1b.static.pornhub.phncdn.com, because there is a 1 pixel image included in this blog post which your browser will have fetched automatically.
Now, that is not illegal, thankfully, but it is probably in the filtering for many large ISPs, so even before this bill comes in it is probably logged.
Don't worry - the image is just a graphic of the word "hub", but this leads to another slight irony. In order to make this slightly less of an invasion of privacy the "Internet Connection Records" are not the whole URL to log which image it was, just the web site. What is worse is if logging by DNS then it does not matter if one innocent image like this or an hour watching the site, it would make one DNS lookup for the web site name.
Could you explain that to the police if it was some illegal site?
It is probably just as well it was not Inspire, a magazine produced by an al-Qaeda-affiliated group, because the police said downloaders of the mag would face prosecution "irrespective of their motive". See this article for more on that (yes, the article is quite safe).