Sky Broadband, one of the largest ISPs in the United Kingdom, has started blocking access to torrent proxy sites. Back in April 2012, the High Court ruled that the UK's largest ISPs had to filter access to The Pirate Bay. Numerous workarounds popped up almost immediately, but these could soon be shut down.
Without so much as a peep, Sky Broadband has blocked access to various services that allow access to The Pirate Bay and Kick Ass Torrents. The blocking appears to have started over the weekend. Customers reported being unable to access these sites. These sites could have been added to the required block list, but it's hard to say as that list isn't public knowledge.
If they are part of the block list, users of the other major ISPs in the UK will soon be unable to access these sites as well.