Feminist site, jezebel.com, a Syrian bloggers site, and the site of a guy who sells Porsches are all blocked by various ISP's:
https://www.blocked.org.uk/personal-stories
The main reason given for the filtering is to protect children, but it seems more than a little dumb to achieve that by treating adults as children.
BTW, my cat's website, LittleGrayGuy.com is blocked by all but one of the ISP's referenced by that site.